1
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Savva M, Alexandropoulos DI, Pissas M, Perlepes SP, Papatriantafyllopoulou C, Sanakis Y, Tasiopoulos AJ. Heterometallic clusters based on an uncommon asymmetric "V-shaped" [Fe 3+(μ-OR)Ln 3+(μ-OR) 2Fe 3+] 6+ (Ln = Gd, Tb, Dy, Ho) structural core and the investigation of the slow relaxation of the magnetization behaviour of the [Fe 2Dy] analogue. Dalton Trans 2023; 52:6997-7008. [PMID: 36789752 DOI: 10.1039/d2dt03938a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
The synthesis, crystal structures, Mössbauer spectra and variable temperature dc and ac magnetic susceptibility studies of a new family of trinuclear heterometallic Fe3+/Ln3+ complexes, [Fe2Ln(PhCO2)3((py)2CO2)((py)2C(OMe)O)2(NO3)Cl] (Ln = Gd (1/Gd), Tb (1/Tb), Dy (1/Dy), and Ho (1/Ho)), where (py)2CO22- and (py)2C(OMe)O- are the anions of the gem-diol and hemiketal derivatives of di-2-pyridyl ketone, are reported. Compounds 1/Ln are based on an asymmetric "V-shaped" [Fe3+(μ-OR)Ln(μ-OR)2Fe3+]6+ structural core formed from the connection of the two terminal Fe3+ centers to the central Ln3+ ion either through one or two alkoxide groups originating from the alkoxide-type bridging ligands. Direct current magnetic susceptibility studies reveal the presence of weak antiferromagnetic interactions between the Fe3+ ions. Alternating current magnetic studies indicate the presence of a slow-magnetic relaxation process in 1/Dy with an energy barrier Ueff = 6.7 (±0.3) K and a pre-exponential factor, τ0 = 2.2 (±0.4) × 10-7 s. The electronic, magnetic and relaxation properties of the complexes were further monitored by variable temperature 57Fe Mössbauer spectroscopy. At T > 80 K the spectra from the complexes comprise two quadrupole doublets the hyperfine parameters of which reflect the distinct coordination environment of the two Fe3+ terminal sites. At T < 20 K, the Mössbauer spectra for 1/Dy are affected by magnetic relaxation effects. At 1.5 K, the spectrum of 1/Dy comprises well defined magnetic sextets indicating relaxation times slower than the characteristic time of the Mössbauer technique (10-7 s) in agreement with the dynamic magnetic measurements. 1/Gd exhibits broad unresolved magnetic sextets at 1.5 K indicating that the spin relaxation time is of the order of the Mössbauer characteristic time at this temperature. For 1/Tb, 1/Ho the Mössbauer spectra exhibit slight broadening even at the lowest available temperature consistent with magnetic relaxation times less than 10-7 s.
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Affiliation(s)
- Maria Savva
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus.
| | | | - Michael Pissas
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Aghia Paraskevi, Athens, Greece.
| | | | | | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Aghia Paraskevi, Athens, Greece.
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2
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Tzani S, Pissas M, Psycharis V, Pantazis DA, Sanakis Y, Raptopoulou CP. Synthesis and structural, magnetic and spectroscopic characterization of iron(III) complexes with in situ formed ligands from methyl-2-pyridyl ketone transformations. Dalton Trans 2023; 52:1582-1594. [PMID: 36651584 DOI: 10.1039/d2dt03944c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Reactions of methyl-2-pyridyl ketone, pyCOMe, with FeCl3·6H2O in various solvents gave complexes [Fe4Cl6(OMe)2(L1)2]·0.7MeCN·0.4MeOH (1·0.7MeCN·0.4MeOH) and [Fe3Cl4(bicine)(L2)]·Me2CO·0.2H2O (2·Me2CO·0.2H2O). The ligands (L1)2- = pyCO(Me)CHCOpy (in 1) and (L2)2- = pyCO(Me)CH2CO(OMe)py (in 2) are formed in situ, through an aldol reaction-type mechanism between the carbanion pyC(O)CH2- (formed by the nucleophilic attack of the MeO- in pyCOMe) and pyCOMe which results in the formation of a new C-C bond. The intermediate compound undergoes attack in the -CH2- or -CO- group by a MeO- group, and the new ligands (L1)2- and (L2)2-, respectively, are formed. The molecular structure of 1 consists of three corner-sharing [Fe2O2] rhombic units in cis-arrangement. The two terminal FeIII ions display distorted square pyramidal geometry and the two central FeIII ions are distorted octahedral. The molecular structure of 2 consists of two corner-sharing [Fe2O2] rhombic units, with the two terminal FeIII ions in distorted square pyramidal geometry and the central FeIII in distorted octahedral. The differentiation in the coordination environment of the FeIII ions in 1-2 is reflected in the values of the Mössbauer hyperfine parameters. In agreement with theoretical calculations, the square pyramidal sites exhibit a smaller isomer shift value in comparison to the octahedral sites. Magnetic studies indicate antiferromagnetic interactions leading to an S = 0 ground state in 1 and to an S = 5/2 ground state in 2, consistent with Electron Paramagnetic Resonance spectroscopy. Mössbauer spectra of 2 indicate the onset of relaxation effects below 80 K. At 1.5 K the spectrum of 2 consists of magnetic sextets. The determined hyperfine magnetic fields are consistent with the exchange coupling scheme imposed by the crystal structure of 2. Theoretical calculations shed light on the differences in the electronic structure between the square pyramidal and the octahedral sites.
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Affiliation(s)
- Sofia Tzani
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Athens, Greece.
| | - Michael Pissas
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Athens, Greece.
| | - Vassilis Psycharis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Athens, Greece.
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Athens, Greece.
| | - Catherine P Raptopoulou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Athens, Greece.
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3
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Syntheses, structural characterizations, and catalytic activities of manganese(II)-aroylhydrazone complexes. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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4
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Synthesis, spectroscopic, quantum, thermal and kinetics, antibacterial and antifungal studies: Novel Schiff base 5-methyl-3-((5-bromosalicylidene) amino)- pyrazole and its transition metal complexes. RESULTS IN CHEMISTRY 2023. [DOI: 10.1016/j.rechem.2023.100813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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5
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Stamou C, Lada ZG, Chasapis CT, Papaioannou D, Dechambenoit P, Perlepes SP. Indium(III)/2-benzoylpyridine chemistry: interesting indium(III) bromide-assisted transformations of the ligand. Dalton Trans 2022; 51:15771-15782. [PMID: 36178466 DOI: 10.1039/d2dt02851d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of 2-benzoylpyridine, (py)(ph)CO, with InX3 (X = Cl, Br) in EtOH at room temperature have been studied. The InCl3/(py)(ph)CO system has provided access to complex [InCl3{(py)(ph)CO}(EtOH)]·{(py)(ph)CO} (1) and the byproduct {(pyH)(ph)CO}Cl (2). The reaction of InBr3 with (py)(ph)CO has led to a mixture of (L)[InBr4{(py)(ph)CO}] (3) and [In2Br4{(py)(ph)CH(O)}2(EtOH)2] (4), where L+ is the 9-oxo-indolo[1,2-a]pyridinium cation and (py)(ph)CH(O)- is the anion of (pyridin-2-yl)methanol. Based on solubility and crystallisation time differences between the two components of the mixture, complex 4 was isolated in pure form, i.e. free from 3. The formations of the counterion L+ and the coordinated (py)(ph)CH(O)- anion represent clearly InBr3-promoted/assisted transformations. Reaction mechanisms have been proposed for the formation of 2, 3 and 4. Complex 4 could also be isolated by the reaction of InBr3 and pre-formed (py)(ph)CH(OH) in EtOH. The solid-state structures of 1, 3 and 4 were determined by single-crystal X-ray crystallography, while the identity of the salt 2 was confirmed by microanalyses and a variety of spectroscopic techniques, including ESI-MS spectra. In the indium(III) complexes, the metal ions are 6-coordinate with a distorted octahedral geometry. The halogeno groups (Cl-, Br-) in the three complexes are terminal. The (py)(ph)CO molecule behaves as a N,O-bidentate (1.11) ligand in 1 and 3. A terminal EtOH ligand completes the coordination sphere of InIII in 1. The alkoxo oxygen atoms of the two 2.21 (py)(ph)CH(O)- ligands doubly bridge the InIII centers in 4 creating a {InIII2(μ-OR)2}4+ core; a nitrogen atom of one reduced organic ligand, two bromo ions and one terminal EtOH molecule complete the 6-coordination at each metal centre. Complexes 1, 3 and 4 were characterised by IR and Raman spectroscopies, and the data were discussed in terms of their known solid-state structures. Molar conductivity data and 1H NMR spectra were used in an attempt to probe the behaviour of the complexes in DMSO. The to-date observed metal ion-assisted/promoted transformations of (py)(ph)CO are also discussed.
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Affiliation(s)
- Christina Stamou
- Department of Chemistry, University of Patras, 26504 Patras, Greece.
| | - Zoi G Lada
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), P.O. Box 1414, Platani, 26504 Patras, Greece
| | - Christos T Chasapis
- NMR Facility, Instrumental Analysis Laboratory, School of Natural Sciences, University of Patras, 26504 Patras, Greece
| | | | - Pierre Dechambenoit
- Centre de Recherche Paul Pascal, UMR 5031, CNRS, University of Bordeaux, 33600 Pessac, France.
| | - Spyros P Perlepes
- Department of Chemistry, University of Patras, 26504 Patras, Greece. .,Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), P.O. Box 1414, Platani, 26504 Patras, Greece
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6
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Skordi K, Anastassiades A, Fournet AD, Kumar R, Schulze M, Wernsdorfer W, Christou G, Nastopoulos V, Perlepes SP, Papatriantafyllopoulou C, Tasiopoulos AJ. High nuclearity structurally - related Mn supertetrahedral T4 aggregates. Chem Commun (Camb) 2021; 57:12484-12487. [PMID: 34747955 DOI: 10.1039/d1cc01815a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The simultaneous employment of 1,3-propanediol and di-2-pyridyl ketone in Mn carboxylate chemistry has provided access to three new, structurally-related [Mn24] and [Mn23] clusters. They are based on nanosized supertetrahedal T4 Mn/O structural cores and exhibit slow relaxation of magnetization below 3.5 K.
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Affiliation(s)
- Katerina Skordi
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus.
| | | | - Adeline D Fournet
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA
| | - Rahul Kumar
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA
| | - Michael Schulze
- Institute of Quantum Materials and Technologies (IQMT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Wolfgang Wernsdorfer
- Institute of Quantum Materials and Technologies (IQMT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA
| | | | | | - Constantina Papatriantafyllopoulou
- Synthesis and Solid-State Pharmaceutical Centre (SSPC), School of Chemistry, College of Science and Engineering, National University of Ireland Galway, University Road, Galway, H91 TK33, Ireland.
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7
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Stoumpos CC, Danelli P, Zahariou G, Pissas M, Psycharis V, Raptopoulou CP, Sanakis Y, Perlepes SP. Di-2-pyridyl ketone-based ligands as evergreen “trees” in the “forest” of manganese chemistry: Mononuclear Mn(III) complexes from the use of MnF3. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Rare nuclearities in Mn/oxo cluster chemistry: Synthesis and characterization of a mixed-valence {MnII/III11} complex bearing acetate and salicylhydroximate(-3) bridging/chelating ligands. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Shi NN, Xie WJ, Zhang DM, Fan YH, Cui LS, Wang M. A mononuclear copper complex as bifunctional electrocatalyst for CO2 reduction and water oxidation. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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10
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Stamou C, Papawassiliou W, Carvalho JP, Konidaris KF, Bekiari V, Dechambenoit P, Pell AJ, Perlepes SP. Indium(III) in the “Periodic Table” of Di(2-pyridyl) Ketone: An Unprecedented Transformation of the Ligand and Solid-State 115In NMR Spectroscopy as a Valuable Structural Tool. Inorg Chem 2021; 60:4829-4840. [DOI: 10.1021/acs.inorgchem.0c03725] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Christina Stamou
- Department of Chemistry, University of Patras, Patras 26504, Greece
| | - Wassilios Papawassiliou
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
| | - José P. Carvalho
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
| | | | - Vlasoula Bekiari
- Department of Crop Science, University of Patras, Messolonghi 30200, Greece
| | - Pierre Dechambenoit
- University of Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR 5031, Pessac 33600, France
| | - Andrew J. Pell
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon, FRE 2034-CNRS, ENS Lyon, UCB Lyon 1, 5 rue de la Doua, Villeurbanne 69100, France
| | - Spyros P. Perlepes
- Department of Chemistry, University of Patras, Patras 26504, Greece
- Foundation for Research and Technology−Hellas (FORTH), Institute of Chemical Engineering Sciences (ICE-HT), Platani,
P.O. Box 1414, Patras 26504, Greece
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11
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Pal S, Nozaki K, Vedernikov AN, Love JA. Reversible Pt II-CH 3 deuteration without methane loss: metal-ligand cooperation vs. ligand-assisted Pt II-protonation. Chem Sci 2021; 12:2960-2969. [PMID: 34164064 PMCID: PMC8179389 DOI: 10.1039/d0sc06518h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Di(2-pyridyl)ketone dimethylplatinum(ii), (dpk)PtII(CH3)2, reacts with CD3OD at 25 °C to undergo complete deuteration of Pt-CH3 fragments in ∼5 h without loss of methane to form (dpk)PtII(CD3)2 in virtually quantitative yield. The deuteration can be reversed by dissolution in CH3OH or CD3OH. Kinetic analysis and isotope effects, together with support from density functional theory calculations indicate a metal-ligand cooperative mechanism wherein DPK enables Pt-CH3 deuteration by allowing non-rate-limiting protonation of PtII by CD3OD. In contrast, other model di(2-pyridyl) ligands enable rate-limiting protonation of PtII, resulting in non-rate-limiting C-H(D) reductive coupling. Owing to its electron-poor nature, following complete deuteration, DPK can be dissociated from the PtII-centre, furnishing [(CD3)2PtII(μ-SMe2)]2 as the perdeutero analogue of [(CH3)2PtII(μ-SMe2)]2, a commonly used PtII-precursor.
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Affiliation(s)
- Shrinwantu Pal
- Department of Chemistry and Biotechnology, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Andrei N Vedernikov
- Department of Chemistry and Biochemistry, The University of Maryland College Park Maryland 20742 USA
| | - Jennifer A Love
- Department of Chemistry, The University of British Columbia Vancouver British Columbia V6T 1Z1 Canada
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12
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Basak D, Martí ER, Murrie M, Nemec I, Ray D. Solvent-induced structural transformation from heptanuclear to decanuclear [Co–Ln] coordination clusters: trapping of unique counteranion and understanding of aggregation pathways. Dalton Trans 2021; 50:9574-9588. [DOI: 10.1039/d1dt01278a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The MeCN solvent-induced transformations of heptanuclear LnIII3CoII2CoIII2+ cationic aggregates, associated with literature unknown Ln(iii)-pivalate-based counter anions, to decanuclear LnIII3CoII3/2CoIII4/5 clusters have been investigated.
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Affiliation(s)
- Dipmalya Basak
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721 302
- India
| | | | - Mark Murrie
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | - Ivan Nemec
- Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- 77147 Olomouc
- Czech Republic
| | - Debashis Ray
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721 302
- India
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13
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Kirst C, Reichel M, Karaghiosoff K. Coordination complexes of di(2-pyridyl)ketone with copper(I) and their formation in solution and under solvent-free conditions. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.119951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Noori M, Shafaatian B, Notash B. New organoplatinum complexes containing di-2-pyridyl ketone; single crystal structure determination, solvatochromism and kinetic investigations. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Mayans J, Stoumpos CC, Font‐Bardia M, Escuer A. From Bowls to Capsules: Assembly of Hexanuclear Ni
II
Rings Tailored by Alkali Cations. Chemistry 2020; 26:11158-11169. [DOI: 10.1002/chem.202001900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 05/06/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Júlia Mayans
- Instituto de Ciencia Molecular (ICMol)Universidad de Valencia Jose Beltran 2 46980 Paterna (Valencia) Spain
| | - Constantinos C. Stoumpos
- Department of Materials Science and TechnologyUniversity of Crete, P. O. Box 2208 71003 Heraklion Greece
| | - Mercé Font‐Bardia
- Departament de Mineralogia, Cristallografia i Dipòsits Minerals and Unitat de Difracció de R-X. Centre Científic i Tecnològic (CCiTUB)Universitat de Barcelona Martí Franqués s/n Barcelona 08028 Spain
| | - Albert Escuer
- Departament de Química Inorgànica i Orgànica, Secció Inorgànica and Institut de Nanociència i Nanotecnologia (IN2UB)Universitat de Barcelona Martí i Franques 1–11 Barcelona 08028 Spain
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16
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Masternak J, Gilewska A, Barszcz B, Łakomska I, Kazimierczuk K, Sitkowski J, Wietrzyk J, Kamecka A, Milczarek M. Ruthenium(II) and Iridium(III) Complexes as Tested Materials for New Anticancer Agents. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3491. [PMID: 32784666 PMCID: PMC7475896 DOI: 10.3390/ma13163491] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/27/2020] [Accepted: 08/03/2020] [Indexed: 11/17/2022]
Abstract
The oncological use of cisplatin is hindered by its severe side effects and a very important resistance problem. To overcome these problems, scientists have attempted to design new generation transition-metal anticancer complexes. In this study, we present new complexes, ruthenium(II) [(η6-p-cymene)RuCl(py2CO)]PF6 (1), iridium(III) [(η5-Cp)IrCl(py2CO)]PF6 (2), and NH4[IrCl4(py2CO)]·H2O (3), based on di-2-pyridylketone (py2CO). The prepared complexes were characterized by FTIR, 1H, 13C, 15N NMR, UV-Vis, PL and elemental analysis techniques. The single-crystal X-ray structure analysis and comparative data revealed pseudo-octahedral half-sandwich 1 and 2 complexes and octahedral tetrachloroiridate(III) 3 with a rare chelating κ2N,O coordination mode of py2CO. The compounds were tested in vitro against three cancer cell lines-colorectal adenoma (LoVo), myelomonocytic leukaemia (MV-4-11), breast adenocarcinoma (MCF-7), and normal fibroblasts (BALB/3T3). The most promising results were obtained for iridium(III) complex 3 against MV-4-11 (IC50 = 35.8 ± 13.9 µg/mL) without a toxic effect against normal BALB/3T3, which pointed towards its selectivity as a potential anticancer agent. Extensive research into their mode of binding with DNA confirmed for 1 and 2 complexes non-classical binding modes, while the 3D circular dichroism (CD) experiment (ΔTm) suggested that 3 induced the probable formation of covalent bonds with DNA. In addition, the obtained iridium complexes induce ROS, which, in synergy with hydrolysis promoting DNA bonding, may lead to cancer cell death.
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Affiliation(s)
- Joanna Masternak
- Institute of Chemistry, Jan Kochanowski University, Uniwersytecka 7, 25-406 Kielce, Poland; (A.G.); (B.B.)
| | - Agnieszka Gilewska
- Institute of Chemistry, Jan Kochanowski University, Uniwersytecka 7, 25-406 Kielce, Poland; (A.G.); (B.B.)
| | - Barbara Barszcz
- Institute of Chemistry, Jan Kochanowski University, Uniwersytecka 7, 25-406 Kielce, Poland; (A.G.); (B.B.)
| | - Iwona Łakomska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Katarzyna Kazimierczuk
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 G., 80-233 Gdańsk, Poland;
| | - Jerzy Sitkowski
- Institute of Organic Chemistry, Polish Academic of Science, Kasprzaka 44/52, 01-224 Warszawa, Poland;
- National Medicines Institute, Chełmska 30/34, 00-725 Warszawa, Poland
| | - Joanna Wietrzyk
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, R. Weigla 12, 53-114 Wrocław, Poland; (J.W.), (M.M.)
| | - Anna Kamecka
- Institute of Chemistry, Faculty of Sciences, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110 Siedlce, Poland;
| | - Magdalena Milczarek
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, R. Weigla 12, 53-114 Wrocław, Poland; (J.W.), (M.M.)
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Arizaga L, Cañon-Mancisidor W, Gancheff JS, Burrow RA, Armentano D, Lloret F, González R, Kremer C, Chiozzone R. New hexanuclear FeIII clusters with the gem-diol hydrated form of di(2-pyridyl)ketone and carboxylato ligands: Crystal structures and magnetic properties. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Mayans J, Font-Bardia M, Escuer A. Lithium cations in a self-assembled electrostatic nanocapsule. Dalton Trans 2019; 48:16158-16161. [PMID: 31624820 DOI: 10.1039/c9dt03600h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cascade self-assembly of small components, without the employment of preformed hosts, yielded a {Ni12Li2} nanometric capsule with multiple endo- and exo-guests (water molecules, Li+, and Et3NH+ cations) linked to selective hydrophilic and hydrophobic binding sites of NiII hexanuclear metallamacrocycles. The synthesis was achieved by using (Bu4N)N3 as a starting reagent instead of the conventional sodium azide to selectively introduce the Li+ cations.
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Affiliation(s)
- Júlia Mayans
- Departament de Química Inorgànica i Orgànica, SeccióInorgànica and Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Martí i Franquès 1-11, Barcelona-08028, Spain.
| | - Mercé Font-Bardia
- Departament de Mineralogia, Cristal·lografia i DipòsitsMinerals and Unitat de Difracció de R-X, Centre Científic i Tecnològic de la Universitat de Barcelona (CCiTUB), Universitat de Barcelona, Solé i Sabarís 1-3, 08028 Barcelona, Spain
| | - Albert Escuer
- Departament de Química Inorgànica i Orgànica, SeccióInorgànica and Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Martí i Franquès 1-11, Barcelona-08028, Spain.
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19
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Abbasi P, Athanasopoulou AA, Mazarakioti EC, Gagnon KJ, Teat SJ, Escuer A, Pilkington M, Stamatatos TC. Click chemistry as a route to the synthesis of structurally new and magnetically interesting coordination clusters: a {Ni} complex with a trapezoidal prismatic topology. Dalton Trans 2019; 48:11632-11636. [PMID: 31274137 DOI: 10.1039/c9dt01998g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of a new {Ni8} cluster bearing tetrazolate- and azido-bridging ligands, and supported by chelating α-methyl-2-pyridine-methanol (mpmH) groups, is described herein. The reported compound has a unique trapezoidal prismatic topology, resulting from an unexpected in situ click reaction between the MeCN reaction solvent and the N3- ions under mild, room-temperature conditions. Such a click chemistry approach to the preparation of 0-D compounds is relatively unexplored and represents a fruitful strategy for the synthesis of new coordination clusters and molecule-based magnetic materials.
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Affiliation(s)
- Parisa Abbasi
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
| | - Angeliki A Athanasopoulou
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
| | - Eleni C Mazarakioti
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
| | - Kevin J Gagnon
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Simon J Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Albert Escuer
- Department de Quimica Inorgànica i Orgànica, Secció Inorgànica and Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, Martí Franqués 1-11, 08028 Barcelona, Spain
| | - Melanie Pilkington
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
| | - Theocharis C Stamatatos
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
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20
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Diversity of Coordination Modes in a Flexible Ditopic Ligand Containing 2-Pyridyl, Carbonyl and Hydrazone Functionalities: Mononuclear and Dinuclear Cobalt(III) Complexes, and Tetranuclear Copper(II) and Nickel(II) Clusters. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5030039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Syntheses, crystal structures and characterization are reported for four new complexes [Cu4Br2(L)4]Br2 (1), [Ni4(NO3)2(L)4(H2O)](NO3)2 (2), [Co2(L)3](ClO4)3 (3) and [Co(L)2](ClO4) (4), where L− is the monoanion of the ditopic ligand N′-(1-(pyridin-2-yl)ethylidene)pyridine-2-carbohydrazide (LH) built on a picolinoyl hydrazone core fragment, and possessing a bidentate and a tridentate coordination pocket. The tetranuclear cation of 1·0.8H2O·MeOH is a strictly planar, rectangular [2 × 2] grid. Two 2.21011 L− ligands bridge adjacent CuII atoms on the short sides of the rectangle through their alkoxide oxygen atoms, and two 2.11111 ligands bridge adjacent CuII atoms on the long sides of the rectangle through their diazine groups; two metal ions are 5-coordinate and two are 6-coordinate. The tetranuclear cation of 2·0.2H2O·3EtOH is a square [2 × 2] grid. The two 6-coordinate NiII atoms of each side of the square are bridged by the alkoxide O atom of one 2.21011 L− ligand. The dinuclear cation of 3·0.8H2O·1.3MeOH contains two low-spin octahedral CoIII ions bridged by three 2.01111 L− ligands forming a pseudo triple helicate. In the mononuclear cation [Co(L)2]+ of complex 4, the low-spin octahedral CoIII center is coordinated by two tridentate chelating, meridional 1.10011 ligands. The crystal structures of the complexes are stabilized by a variety of π–π stacking and/or H-bonding interactions. Compounds 2, 3 and 4 are the first structurally characterized nickel and cobalt complexes of any form (neutral or anionic) of LH. The 2.01111 and 1.10011 coordination modes of L−, observed in the structures of complexes 3 and 4, have been crystallographically established for the first time in coordination complexes containing this anionic ligand. Variable-temperature, solid-state dc magnetic susceptibility and variable-field magnetization studies at 1.8 K were carried out on complexes 1 and 2. Antiferromagnetic metal ion···metal ion exchange interactions are present in both complexes. The study reveals that the cation of 1 can be considered as a practically isolated pair of strongly antiferromagnetically coupled (through the diazine group of L−) dinulear units. The susceptibility data for 2 were fit to a single-J model for an S = 1 cyclic tetramer. The values of the J parameters have been rationalized in terms of known magnetostructural correlations. Spectral data (infrared (IR), ultraviolet/visible (UV/VIS), 1H nuclear magnetic resonance (NMR) for the diamagnetic complexes) are also discussed in the light of the structural features of 1–4 and the coordination modes of the organic and inorganic ligands that are present in the complexes. The combined work demonstrates the ligating flexibility of L−, and its usefulness in the synthesis of complexes with interesting structures and properties.
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21
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A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5020035] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The synthesis, structural characterization and magnetic study of novel CoII/4f and CoII/YIII clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)2CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [CoII2MIII{(py)2C(OEt)(O)}4(NO3)(H2O)]2[M(NO3)5](ClO4)2 (M = Gd, 1; Dy, 2; Tb, 3; Y, 4), where (py)2C(OEt)(O)− is the monoanion of the hemiketal form of (py)2CO. Clusters 1–4 are the first reported Co/4f (1–3) and Co/Y (4) species bearing (py)2CO or its derivatives, despite the fact that over 200 metal clusters bearing this ligand have been reported so far. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on 1–4 and revealed the presence of weak ferromagnetic exchange interactions between the metal ions (JCo-Co = +1.3 and +0.40 cm−1 in 1 and 4, respectively; JCo-Gd = +0.09 cm−1 in 1). The ac susceptibility studies on 2 revealed nonzero, weak out-of-phase (χ’’M) signals below ~5 K.
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22
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Stamatatos TC, Rentschler E. Organic chelate-free and azido-rich metal clusters and coordination polymers from the use of Me3SiN3: a new synthetic route to complexes with beautiful structures and diverse magnetic properties. Chem Commun (Camb) 2019; 55:11-26. [DOI: 10.1039/c8cc08854c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A new synthetic route to structurally novel and magnetically interesting 3d-metal azido clusters and coordination polymers is presented; the key reagent for the preparation of solely azido-bridged molecule-based species is the organic azide precursor Me3SiN3.
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Affiliation(s)
| | - Eva Rentschler
- Institute of Inorganic and Analytical Chemistry
- Johannes Gutenberg University Mainz
- D-55128 Mainz
- Germany
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23
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Krause J, Alexandropoulos DI, Carrella LM, Rentschler E, Stamatatos TC. Increasing the nuclearity and spin ground state in a new family of ferromagnetically-coupled {Ni 10} disk-like complexes bearing exclusively end-on bridging azido ligands. Chem Commun (Camb) 2018; 54:12499-12502. [PMID: 30345439 DOI: 10.1039/c8cc07722c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of a new family of ferromagnetically-coupled {Ni10} clusters counterbalanced by various [Ln(NO3)5]2- ions is herein described. The resulting compounds are organic chelate-free and the metal ions are exclusively bridged by end-on azido ligands to stabilize a beautiful disk-like topology reminiscent of the structure of the brucite mineral.
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Affiliation(s)
- Jasmin Krause
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
| | - Dimitris I Alexandropoulos
- Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
| | - Luca M Carrella
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
| | - Eva Rentschler
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
| | - Theocharis C Stamatatos
- Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany. and Department of Chemistry, 1812 Sir Isaac Brock Way, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.
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24
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Maniaki D, Pilichos E, Perlepes SP. Coordination Clusters of 3d-Metals That Behave as Single-Molecule Magnets (SMMs): Synthetic Routes and Strategies. Front Chem 2018; 6:461. [PMID: 30356793 PMCID: PMC6190736 DOI: 10.3389/fchem.2018.00461] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 09/14/2018] [Indexed: 11/18/2022] Open
Abstract
The area of 3d-metal coordination clusters that behave as Single-Molecule Magnets (SMMs) is now quite mature within the interdisciplinary field of Molecular Magnetism. This area has created a renaissance in Inorganic Chemistry. From the synthetic Inorganic Chemistry viewpoint, the early years of "try and see" exercises (1993-2000) have been followed by the development of strategies and strict approaches. Our review will first summarize the early synthetic efforts and routes for the preparation of polynuclear 3d-metal SMMs, and it will be then concentrated on the description of the existing strategies. The former involve the combination of appropriate 3d-metal-containing starting materials (simple salts with inorganic anions, metal cardoxylates, and pre-formed carboxylate clusters, metal phosphonates) and one or two primary organic ligands; the importance of the end-on azido group as a ferromagnetic coupler in 3d-metal SMM chemistry will be discussed. The utility of comproportionation reactions and the reductive aggregation route for the construction of manganese SMMs will also be described. Most of the existing strategies for the synthesis of SMMs concern manganese. These involve substitution of carboxylate ligands in pre-formed SMMs by other carboxylate or non-carboxylate groups, reduction procedures for the {Mn 8 III Mn 4 IV } SMMs, spin "tweaking," "switching on" SMM properties upon conversion of low-spin clusters into high-spin ones, ground-state spin switching and enhancing SMM properties via targeted structural distortions, the use of radical bridging ligands and supramolecular approaches. A very useful strategy is also the "switching on" of SMM behavior through replacement of bridging hydroxide groups by end-on azido or isocyanato ligands in clusters. Selected examples will be mentioned and critically discussed. Particular emphasis will be given on the criteria for the choice of ligands.
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25
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Coordination and metal ion-mediated transformation of a polydentate ligand containing oxime, hydrazone and picolinoyl functionalities. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.06.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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26
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Menezes DC, de Lima GM, Wardell JL, Gomez-Banderas J, Harrison WT. Structural variety of 2-amidoethyltin compounds. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.08.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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27
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Savva M, Skordi K, Fournet AD, Thuijs AE, Christou G, Perlepes SP, Papatriantafyllopoulou C, Tasiopoulos AJ. Heterometallic MnIII4Ln2 (Ln = Dy, Gd, Tb) Cross-Shaped Clusters and Their Homometallic MnIII4MnII2 Analogues. Inorg Chem 2017; 56:5657-5668. [DOI: 10.1021/acs.inorgchem.7b00191] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Maria Savva
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
| | - Katerina Skordi
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
| | - Adeline D. Fournet
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Annaliese E. Thuijs
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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28
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Lada ZG, Sanakis Y, Raptopoulou CP, Psycharis V, Perlepes SP, Mitrikas G. Probing the electronic structure of a copper(ii) complex by CW- and pulse-EPR spectroscopy. Dalton Trans 2017. [DOI: 10.1039/c7dt01785e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure of a mononuclear octahedral copper(ii) complex has been studied using CW EPR spectroscopy and other advanced methods including Davies ENDOR and HYSCORE (1H and 13C) spectroscopy.
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Affiliation(s)
- Zoi G. Lada
- Foundation for Research and Technology-Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
| | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Catherine P. Raptopoulou
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Vassilis Psycharis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Spyros P. Perlepes
- Foundation for Research and Technology-Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
| | - George Mitrikas
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
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29
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Sagar S, Sengupta S, Mota AJ, Chattopadhyay SK, Espinosa Ferao A, Riviere E, Lewis W, Naskar S. Cubane-like tetranuclear Cu(ii) complexes bearing a Cu4O4 core: crystal structure, magnetic properties, DFT calculations and phenoxazinone synthase like activity. Dalton Trans 2017; 46:1249-1259. [DOI: 10.1039/c6dt03754b] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two tetranuclear copper complexes with a Cu4O4 cubane core exhibiting phenoxazinone synthase like activity are reported.
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Affiliation(s)
- Shipra Sagar
- Department of Chemistry
- Birla Institute of Technology
- Ranchi-835215
- India
| | - Swaraj Sengupta
- Department of Chemistry
- Birla Institute of Technology
- Ranchi-835215
- India
- Department of Chemistry
| | - Antonio J. Mota
- Department of Inorganic Chemistry
- Faculty of Sciences
- University of Granada
- 18002 Granada
- Spain
| | - Shyamal K. Chattopadhyay
- Department of Chemistry
- Indian Institute of Engineering Science and Technology-Shibpur
- Howrah-711103
- India
| | | | - Eric Riviere
- Equipe Chimie Inorganique
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- Université Paris Sud
- 91400 Orsay
- France
| | - William Lewis
- School of Chemistry
- University of Nottingham
- Nottingham NG7 2RD
- UK
| | - Subhendu Naskar
- Department of Chemistry
- Birla Institute of Technology
- Ranchi-835215
- India
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30
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Adebayo OA, Abboud KA, Christou G. New mixed-valence MnII4MnIV clusters from an unusual ligand transformation. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.10.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Chiang CH, Tzeng YW, Yang CI, Nakano M, Wan WL, Lai LL, Lee GH. The synthesis of three new Cu5, Cu8 and Cu12 clusters via the use of a semi-flexible aminotriazine-based bis-methylpyridine ligand. Dalton Trans 2017; 46:1237-1248. [DOI: 10.1039/c6dt04236h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of a semi-flexible aminotriazine-based bis-methylpyridine ligand afforded three new Cu5, Cu8 and Cu12 complexes.
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Affiliation(s)
| | - Yen-Wen Tzeng
- Department of Chemistry
- Tunghai University
- Taichung 407
- Taiwan
| | - Chen-I. Yang
- Department of Chemistry
- Tunghai University
- Taichung 407
- Taiwan
| | - Motohiro Nakano
- Division of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | - Wun-Long Wan
- Department of Applied Chemistry
- National Chi Nan University
- Nantou 545
- Taiwan
| | - Long-Li Lai
- Department of Applied Chemistry
- National Chi Nan University
- Nantou 545
- Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry
- National Taiwan University
- Taipei
- Taiwan
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32
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Lada ZG, Soto Beobide A, Savvidou A, Raptopoulou CP, Psycharis V, Voyiatzis GA, Turnbull MM, Perlepes SP. A unique copper(ii)-assisted transformation of acetylacetone dioxime in acetone that leads to one-dimensional, quinoxaline-bridged coordination polymers. Dalton Trans 2017; 46:260-274. [DOI: 10.1039/c6dt03595g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A novel CuII-assisted transformation of acetylacetone dioxime to coordinated quinoxaline has been discovered.
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Affiliation(s)
- Zoi G. Lada
- Foundation for Research and Technology- Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
| | - Amaia Soto Beobide
- Foundation for Research and Technology- Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
| | | | | | | | - George A. Voyiatzis
- Foundation for Research and Technology- Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
| | - Mark M. Turnbull
- Carlson School of Chemistry and Biochemistry
- Clark University
- Worcester
- USA
| | - Spyros P. Perlepes
- Foundation for Research and Technology- Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
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Calancea S, Reis SG, Guedes GP, Cassaro RAA, Semaan F, López-Ortiz F, Vaz MG. A new family of multinuclear mixed-ligand copper(II) clusters: Crystal structures, magnetic properties and catecholase-like activity. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.07.057] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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A Ni11 Coordination Cluster from the Use of the Di-2-Pyridyl Ketone/Acetate Ligand Combination: Synthetic, Structural and Magnetic Studies. MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2030030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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35
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Perlepe PS, Cunha-Silva L, Bekiari V, Gagnon KJ, Teat SJ, Escuer A, Stamatatos TC. Structural diversity in Ni(II) cluster chemistry: Ni5, Ni6, and {NiNa2}n complexes bearing the Schiff-base ligand N-naphthalidene-2-amino-5-chlorobenzoic acid. Dalton Trans 2016; 45:10256-70. [PMID: 27240998 DOI: 10.1039/c6dt01162d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The employment of the fluorescent bridging and chelating ligand N-naphthalidene-2-amino-5-chlorobenzoic acid (nacbH2) in Ni(II) cluster chemistry has led to a series of pentanuclear and hexanuclear compounds with different structural motifs, magnetic and optical properties, as well as an interesting 1-D coordination polymer. Synthetic parameters such as the inorganic anion present in the NiX2 starting materials (X = ClO4(-) or Cl(-)), the reaction solvent and the nature of the organic base employed for the deprotonation of nacbH2 were proved to be structure-directing components. Undoubtedly, the reported results demonstrate the rich coordination chemistry of nacbH2 in the presence of Ni(II) metal ions and the ability of this chelate to adopt a variety of different modes, thus fostering the formation of high-nuclearity molecules with many physical properties.
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Affiliation(s)
- Panagiota S Perlepe
- Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada.
| | - Luís Cunha-Silva
- REQUIMTE/LAQV & Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
| | - Vlasoula Bekiari
- Department of Aquaculture and Fisheries Management, Technological Educational Institute of Western Greece, 30 200 Messolonghi, Greece
| | - Kevin J Gagnon
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Simon J Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Albert Escuer
- Departament de Quimica Inorganica and Institut de Nanociencia i Nanotecnologia (IN2UB), Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
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Speed S, Casanovas B, Vicente R. μ1,1-R-phenylcyanamido bridges as a new safe synthetic strategy for ferromagnetic molecular clusters. Dalton Trans 2016; 45:5395-403. [PMID: 26907722 DOI: 10.1039/c5dt04306a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of Ni(NO3)2·6H2O with di-2-pyridyl ketone, (py)2CO, and the R-phenylcyanamides 4Cl-3CF3-PhHNCN and 4F-3CF3-PhHNCN in CH3OH or CH3CH2OH allows the isolation of the tetranuclear compounds [(Ni4(μ-py2COOCH3)2(μ3-py2COOH)2(μ1,1-4Cl-3CF3-PhNCN)2(4Cl-3CF3-PhNCN)2]·CH3OH (1), [(Ni4(μ-py2COOCH2CH3)2(μ3-py2COOH)2(μ1,1-4Cl-3CF3-PhNCN)2(4Cl-3CF3-PhNCN)2]·2EtOH (2) and [(Ni4(μ-py2COOCH3)2(μ3-py2COOH)2(μ1,1-4F-3CF3-PhNCN)2(4F-3CF3-PhNCN)2]·4CH3OH (3). {(py)2C(OH)O}(-) and {(py)2C(OR)O}(-) are the monoanions of the gem-diol and hemiketal (R = CH3, CH2CH3) forms of (py)2CO. X-ray diffraction analysis reveals defective double-cubane tetrameric entities in which the Ni(II) atoms are linked by μ1,1-R-phenylcyanamido bridges and two kinds of O-bridges. The molar magnetic susceptibility measurements of 1-3 in the 2-300 K range indicate bulk ferromagnetic coupling.
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Affiliation(s)
- Saskia Speed
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain. and Institut des Sciences Chimiques de Rennes, Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Berta Casanovas
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.
| | - Ramon Vicente
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.
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37
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Kitos AA, Giannopoulos DP, Papatriantafyllopoulou C, Cunha-Silva L, Perlepes SP. A square planar nickel(II) complex derived from a unique metal ion-promoted transformation of 2-benzoylpyridine. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2015.12.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Perlepe PS, Cunha-Silva L, Gagnon KJ, Teat SJ, Lampropoulos C, Escuer A, Stamatatos TC. “Ligands-with-Benefits”: Naphthalene-Substituted Schiff Bases Yielding New NiII Metal Clusters with Ferromagnetic and Emissive Properties and Undergoing Exciting Transformations. Inorg Chem 2016; 55:1270-7. [DOI: 10.1021/acs.inorgchem.5b02492] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Panagiota S. Perlepe
- Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - Luís Cunha-Silva
- REQUIMTE/LAQV and Department of Chemistry
and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
| | - Kevin J. Gagnon
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Christos Lampropoulos
- Department
of Chemistry, University of North Florida, Jacksonville, Florida 32224, United States
| | - Albert Escuer
- Departament de Quimica Inorganica and Institut de Nanociencia i Nanotecnologia, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
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39
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Nawrot I, Machura B, Kruszynski R. Exploration of Cd(ii)/pseudohalide/di-2-pyridyl ketone chemistry – rational synthesis, structural analysis and photoluminescence. CrystEngComm 2016. [DOI: 10.1039/c6ce00112b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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40
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Giannopoulos DP, Cunha-Silva L, Ballesteros-Garrido R, Ballesteros R, Abarca B, Escuer A, Stamatatos TC. New structural motifs in Mn cluster chemistry from the ketone/gem-diol and bis(gem-diol) forms of 2,6-di-(2-pyridylcarbonyl)pyridine: {MnII4MnIII2} and {MnII4MnIII6} complexes. RSC Adv 2016. [DOI: 10.1039/c6ra22953k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The ketone/gem-diol (L1H2) and bis(gem-diol) (L2H4) forms of the ligand 2,6-di-(2-pyridylcarbonyl)pyridine in Mn cluster chemistry have afforded the new complexes [MnII4MnIII2(N3)6Cl4(L1)2(DMF)4] and [MnII4MnIII6O2(N3)12(L1)2(L2H)2(DMF)6].
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Affiliation(s)
| | - Luís Cunha-Silva
- REQUIMTE-LAQV
- Department of Chemistry and Biochemistry
- Faculty of Sciences
- University of Porto
- 4169-007 Porto
| | | | - Rafael Ballesteros
- Departamento de Química Orgánica
- Faculdad de Farmacia
- Universidad de Valencia
- 46100 Burjassot
- Spain
| | - Belén Abarca
- Departamento de Química Orgánica
- Faculdad de Farmacia
- Universidad de Valencia
- 46100 Burjassot
- Spain
| | - Albert Escuer
- Departament de Quimica Inorganica i Organica
- Seccio Inorgànica and Institut de Nanociencia i Nanotecnologia (IN2UB)
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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41
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Kitos AA, Efthymiou CG, Manos MJ, Tasiopoulos AJ, Nastopoulos V, Escuer A, Perlepes SP. Interesting copper(ii)-assisted transformations of 2-acetylpyridine and 2-benzoylpyridine. Dalton Trans 2016; 45:1063-77. [DOI: 10.1039/c5dt03912f] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel CuII-assisted transformations have been observed in the reactions of copper(ii) sources and 2-pyridyl ketones.
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Affiliation(s)
| | | | - Manolis J. Manos
- Department of Chemistry
- University of Cyprus
- 1678 Nicosia
- Cyprus
- Department of Chemistry
| | | | | | - Albert Escuer
- Departament de Quimica Inorganica and Institute of Nanoscience and Nanotechnology (IN2UB)
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Spyros P. Perlepes
- Department of Chemistry
- University of Patras
- 26504 Patras
- Greece
- Institute of Chemical Engineering Sciences
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42
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43
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Single-Crystal to Single-Crystal Reversible Transformations Induced by Thermal Dehydration in Keggin-Type Polyoxometalates Decorated with Copper(II)-Picolinate Complexes: The Structure Directing Role of Guanidinium. INORGANICS 2015. [DOI: 10.3390/inorganics3020194] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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44
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Giannopoulos DP, Wilson-Konderka C, Gagnon KJ, Teat SJ, Escuer A, Metallinos C, Stamatatos TC. Synthesis and first use of pyridine-2,6-diylbis(pyrazine-2-ylmethanone) in metal cluster chemistry: a {MnIII3Na2} complex with an ideal trigonal bipyramidal geometry. Dalton Trans 2015; 44:4318-27. [DOI: 10.1039/c4dt03666b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new {Mn3Na2} compound with trigonal bipyramidal topology was obtained from a metal-assisted transformation of the ligand (pz)CO(py)CO(pz).
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Affiliation(s)
| | | | - Kevin J. Gagnon
- Advanced Light Source
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - Simon J. Teat
- Advanced Light Source
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - Albert Escuer
- Departament de Quimica Inorganica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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45
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Syntheses, X-ray crystal structures and spectroscopic characterization of rare μ-di-σ pyrazole based bridging keto carbonyl complexes derived from Cd(II) salts. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Duros V, Sartzi H, Teat SJ, Sanakis Y, Roubeau O, Perlepes SP. Tris{2,4-bis(2-pyridyl)-1,3,5-triazapentanedienato}manganese(III), a complex derived from a unique metal ion-assisted transformation of pyridine-2-amidoxime. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.10.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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47
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The bridging azido ligand as a central “player” in high-nuclearity 3d-metal cluster chemistry. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.04.001] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Tsui EY, Kanady JS, Agapie T. Synthetic cluster models of biological and heterogeneous manganese catalysts for O2 evolution. Inorg Chem 2014; 52:13833-48. [PMID: 24328344 DOI: 10.1021/ic402236f] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Artificial photosynthesis has emerged as an important strategy toward clean and renewable fuels. Catalytic oxidation of water to O2 remains a significant challenge in this context. A mechanistic understanding of currently known heterogeneous and biological catalysts at a molecular level is highly desirable for fundamental reasons as well as for the rational design of practical catalysts. This Award Article discusses recent efforts in synthesizing structural models of the oxygen-evolving complex of photosystem II. These structural motifs are also related to heterogeneous mixed-metal oxide catalysts. A stepwise synthetic methodology was developed toward achieving the structural complexity of the targeted active sites. A geometrically restricted multinucleating ligand, but with labile coordination modes, was employed for the synthesis of low-oxidation-state trimetallic species. These precursors were elaborated to site-differentiated tetrametallic complexes in high oxidation states. This methodology has allowed for structure-reactivity studies that have offered insight into the effects of different components of the clusters. Mechanistic aspects of oxygen-atom transfer and incorporation from water have been interrogated. Significantly, a large and systematic effect of redox-inactive metals on the redox properties of these clusters was discovered. With the pKa value of the redox-inactive metal-aqua complex as a measure of the Lewis acidity, structurally analogous clusters display a linear dependence between the reduction potential and acidity; each pKa unit shifts the potential by ca. 90 mV. Implications for the function of the biological and heterogeneous catalysts are discussed.
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Affiliation(s)
- Emily Y Tsui
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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49
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Hui AK, Cook BJ, Mindiola DJ, Caulton KG. Transition Metal Chlorides Are Lewis Acids toward Terminal Chloride Attached to Late Transition Metals. Inorg Chem 2014; 53:3307-10. [DOI: 10.1021/ic402107z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Alice K. Hui
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Brian J. Cook
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Daniel J. Mindiola
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Kenneth G. Caulton
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
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50
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Tzeng YW, Lin CJ, Nakano M, Yang CI, Wan WL, Lai LL. A semi-flexible aminotriazine-based bis-methylpyridine ligand for the design of nickel(II) spin clusters. Dalton Trans 2014; 43:3044-7. [PMID: 24264831 DOI: 10.1039/c3dt52903g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The self-assembly of a semi-flexible aminotriazine-based bis-methylpyridine ligand, N(2),N(2)-dibenzyl-N(4),N(6)-di(pyridylmethyl)-1,3,5-triazine-2,4,6-triamine (H2L), with NiCl2 and NiBr2 afforded two new nickel(II) clusters, (H2NMe2)2[Ni5(OH)2(H2L)2Cl10] (1) and [Ni6(OH)2(H2L)2Br10(THF)2] (2) showing a high spin ground state of S = 3.
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Affiliation(s)
- Yen-Wen Tzeng
- Department of Chemistry, Tunghai University, Taichung 407, Taiwan.
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