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Haiduc I. Inverse coordination complexes with oxoanions as centroligands. A review of topologies. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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2
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Anwar MU, Al-Harrasi A, Rawson JM. Structures, properties and applications of Cu(II) complexes with tridentate donor ligands. Dalton Trans 2021; 50:5099-5108. [PMID: 33881088 DOI: 10.1039/d1dt00483b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Tridentate ligands offer theree donor atoms to coordinate to metal ions. The remaining vacant coordination sites on the metal ions provided opportunities to implement additional co-ligands to generate complexes with desired properties. Herein we discuss selected examples of Cu(ii) complexes with tridentate ligands utilizing combinations of N, O, S, and Se donors, focusing on effects of ligand flexibility/rigidity on their coordination modes, properties and applications.
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Affiliation(s)
- Muhammad Usman Anwar
- Natural and Medical Sciences Research Centre, University of Nizwa, Birkat Almouz 616, Oman.
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Centre, University of Nizwa, Birkat Almouz 616, Oman.
| | - Jeremy M Rawson
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Ave, Windsor, ON N9B3P4, Canada.
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3
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Avwioroko OJ, Anigboro AA, Atanu FO, Otuechere CA, Alfred MO, Abugo JN, Omorogie MO. Investigation of the binding interaction of α-amylase with Chrysophyllum albidum seed extract and its silver nanoparticles: A multi-spectroscopic approach. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.cdc.2020.100517] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Diez-Castellnou M, Salassa G, Mancin F, Scrimin P. The Zn(II)-1,4,7-Trimethyl-1,4,7-Triazacyclononane Complex: A Monometallic Catalyst Active in Two Protonation States. Front Chem 2019; 7:469. [PMID: 31334218 PMCID: PMC6616306 DOI: 10.3389/fchem.2019.00469] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 06/19/2019] [Indexed: 11/13/2022] Open
Abstract
In this paper, the unusual reactivity of the complex Zn(II)-1,4,7-trimethyl-1, 4,7-triazacyclononane (2) in the transesterification of the RNA-model substrate, HPNP (3), is reported. The dependence of the reactivity (k2) with pH does not follow the characteristic bell-shape profile typical of complexes with penta-coordinated metal centers. By the contrary, two reactive species, featuring different deprotonation states, are present, with the tri-aqua complex being more reactive than the mono-hydroxy-diaqua one. Apparently, such a difference arises from the total complex charge which plays an important role in the stability of the transition state/s of the reactions. Relevant insight on the reaction mechanism were hence obtained.
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Affiliation(s)
| | - Giovanni Salassa
- Département de Chimie Physique, Université de Genève, Genève, Switzerland
| | - Fabrizio Mancin
- Dipartimento di Scienze Chimiche, Università di Padova, Padova, Italy
| | - Paolo Scrimin
- Dipartimento di Scienze Chimiche, Università di Padova, Padova, Italy
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6
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Chlorella sorokiniana and Chlorella minutissima exhibit antioxidant potentials, inhibit cholinesterases and modulate disaggregation of β-amyloid fibrils. ELECTRON J BIOTECHN 2019. [DOI: 10.1016/j.ejbt.2019.03.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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7
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Guillou A, Lima LMP, Esteban-Gómez D, Delgado R, Platas-Iglesias C, Patinec V, Tripier R. endo- versus exo-Cyclic coordination in copper complexes with methylthiazolylcarboxylate tacn derivatives. Dalton Trans 2019; 48:8740-8755. [PMID: 31143891 DOI: 10.1039/c9dt01366k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Three tacn (1,4,7-triazacyclononane)-based ligands substituted by methylthiazolylcarboxylate (tha) and/or methylthiazolyl (th) arms have been examined for copper complexation with the aim to study the impact of carboxylate groups on the complexation of Cu(ii), which can present an endo- or exo-cyclic coordination. Two new ligands have been synthesised: H3no3tha, tacn bearing three methylthiazolylcarboxylate arms, and H2no1th2tha, tacn with one methylthiazolyl and two methylthiazolylcarboxylate arms, while Hno2th1tha had already been described. Their complexation behaviour with 1 or 1.5 equivalents of metal was studied on the basis of preliminary results showing the tendency of tha arms to form exocyclic polynuclear species. The solid state studies of the Cu(ii) and Zn(ii) complexes were investigated and some of their structures were characterised by X-ray diffraction. The physicochemical properties of the complexes in solution were also investigated by means of potentiometric measurements, UV-vis spectroscopy, EPR and computational studies, NMR characterisation of the corresponding Zn(ii) complexes and redox behaviour by electrochemistry. Mono- and tri-nuclear complexes ML and M3L2 were formed and isolated, highlighting the tendency of methylthiazolylcarboxylate arms, when carried by a tacn platform, to form exo-cyclic and polynuclear complexes. However, this exhaustive study evidences that the "out of cage" and "in cage" present different behaviour in terms of stability.
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Affiliation(s)
- Amaury Guillou
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France.
| | - Luís M P Lima
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain
| | - Rita Delgado
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain
| | - Véronique Patinec
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France.
| | - Raphaël Tripier
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France.
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8
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Thorarinsdottir AE, Gaudette AI, Harris TD. Spin-crossover and high-spin iron(ii) complexes as chemical shift 19F magnetic resonance thermometers. Chem Sci 2017; 8:2448-2456. [PMID: 28694955 PMCID: PMC5477811 DOI: 10.1039/c6sc04287b] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Accepted: 12/20/2016] [Indexed: 12/22/2022] Open
Abstract
The potential utility of paramagnetic transition metal complexes as chemical shift 19F magnetic resonance (MR) thermometers is demonstrated. Further, spin-crossover FeII complexes are shown to provide much higher temperature sensitivity than do the high-spin analogues, owing to the variation of spin state with temperature in the former complexes. This approach is illustrated through a series of FeII complexes supported by symmetrically and asymmetrically substituted 1,4,7-triazacyclononane ligand scaffolds bearing 3-fluoro-2-picolyl derivatives as pendent groups (L x ). Variable-temperature magnetic susceptibility measurements, in conjunction with UV-vis and NMR data, show thermally-induced spin-crossover for [Fe(L1)]2+ in H2O, with T1/2 = 52(1) °C. Conversely, [Fe(L2)]2+ remains high-spin in the temperature range 4-61 °C. Variable-temperature 19F NMR spectra reveal the chemical shifts of the complexes to exhibit a linear temperature dependence, with the two peaks of the spin-crossover complex providing temperature sensitivities of +0.52(1) and +0.45(1) ppm per °C in H2O. These values represent more than two-fold higher sensitivity than that afforded by the high-spin analogue, and ca. 40-fold higher sensitivity than diamagnetic perfluorocarbon-based thermometers. Finally, these complexes exhibit excellent stability in a physiological environment, as evidenced by 19F NMR spectra collected in fetal bovine serum.
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Affiliation(s)
- Agnes E Thorarinsdottir
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
| | - Alexandra I Gaudette
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
| | - T David Harris
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
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9
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Nakajima T, Yamashiro C, Taya M, Kure B, Tanase T. Systematic Synthesis of Di‐, Tri‐, and Tetranuclear Homo‐ and Heterometal Complexes Using a Mononuclear Copper Synthon with a Tetradentate Amino Alcohol Ligand. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takayuki Nakajima
- Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐nishi‐machi 630‐8506 Nara Japan
| | - Chisako Yamashiro
- Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐nishi‐machi 630‐8506 Nara Japan
| | - Megumi Taya
- Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐nishi‐machi 630‐8506 Nara Japan
| | - Bunsho Kure
- Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐nishi‐machi 630‐8506 Nara Japan
| | - Tomoaki Tanase
- Department of Chemistry Faculty of Science Nara Women's University Kitauoya‐nishi‐machi 630‐8506 Nara Japan
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Joshi T, Graham B, Spiccia L. Macrocyclic metal complexes for metalloenzyme mimicry and sensor development. Acc Chem Res 2015; 48:2366-79. [PMID: 26244894 DOI: 10.1021/acs.accounts.5b00142] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Examples of proteins that incorporate one or more metal ions within their structure are found within a broad range of classes, including oxidases, oxidoreductases, reductases, proteases, proton transport proteins, electron transfer/transport proteins, storage proteins, lyases, rusticyanins, metallochaperones, sporulation proteins, hydrolases, endopeptidases, luminescent proteins, iron transport proteins, oxygen storage/transport proteins, calcium binding proteins, and monooxygenases. The metal coordination environment therein is often generated from residues inherent to the protein, small exogenous molecules (e.g., aqua ligands) and/or macrocyclic porphyrin units found, for example, in hemoglobin, myoglobin, cytochrome C, cytochrome C oxidase, and vitamin B12. Thus, there continues to be considerable interest in employing macrocyclic metal complexes to construct low-molecular weight models for metallobiosites that mirror essential features of the coordination environment of a bound metal ion without inclusion of the surrounding protein framework. Herein, we review and appraise our research exploring the application of the metal complexes formed by two macrocyclic ligands, 1,4,7-triazacyclononane (tacn) and 1,4,7,10-tetraazacyclododecane (cyclen), and their derivatives in biological inorganic chemistry. Taking advantage of the kinetic inertness and thermodynamic stability of their metal complexes, these macrocyclic scaffolds have been employed in the development of models that aid the understanding of metal ion-binding natural systems, and complexes with potential applications in biomolecule sensing, diagnosis, and therapy. In particular, the focus has been on "coordinatively unsaturated" metal complexes that incorporate a kinetically inert and stable metal-ligand moiety, but which also contain one or more weakly bound ligands, allowing for the reversible binding of guest molecules via the formation and dissociation of coordinate bonds. With regards to mimicking metallobiosites, examples are presented from our work on tacn-based complexes developed as simplified structural models for multimetallic enzyme sites. In particular, structural comparisons are made between multinuclear copper(II) complexes formed by such ligands and multicopper enzymes featuring type-2 and type-3 copper centers, such as ascorbate oxidase (AO) and laccase (Lc). Likewise, with the aid of relevant examples, we highlight the importance of cooperativity between either multiple metal centers or a metal center and a proximal auxiliary unit appended to the macrocyclic ligand in achieving efficient phosphate ester cleavage. Finally, the critical importance of the Zn(II)-imido and Zn(II)-phosphate interactions in Zn-cyclen-based systems for delivering highly sensitive electrochemical and fluorescent chemosensors is also showcased. The Account additionally highlights some of the factors that limit the performance of these synthetic nucleases and the practical application of the biosensors, and then identifies some avenues for the development of more effective macrocyclic constructs in the future.
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Affiliation(s)
- Tanmaya Joshi
- School
of Chemistry, Monash University, Victoria 3800, Australia
| | - Bim Graham
- Monash
Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Leone Spiccia
- School
of Chemistry, Monash University, Victoria 3800, Australia
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11
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Ning Y, Gao M, Zheng K, Zhang Z, Zhou J, Hao X, Cao R. Phosphate monoester hydrolysis at tricopper site: The advantage and disadvantage of closely assembled trimetallic active sites. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.03.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Kalita AC, Gogoi N, Jangir R, Kuppuswamy S, Walawalkar MG, Murugavel R. Ab Initio Chemical Synthesis of Designer Metal Phosphate Frameworks at Ambient Conditions. Inorg Chem 2014; 53:8959-69. [DOI: 10.1021/ic500810d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Alok Ch. Kalita
- Department
of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Nayanmoni Gogoi
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
| | - Ritambhara Jangir
- Department
of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Subramaniam Kuppuswamy
- Department
of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | | | - Ramaswamy Murugavel
- Department
of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
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SARDROODI JABERJAHANBIN, RASTKAR ALIREZA, YOUSEFNIA NEGARRAD, AZAMAT JAFAR. COMPARATIVE INVESTIGATION OF THE EFFECT OF TYPE OF DENSITY FUNCTIONAL IN THE DETERMINATION OF GEOMETRICAL PARAMETERS IN A Cu COMPLEX. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633613500661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The effects of short-range electron correlation, long-range electron exchange, local and nonlocal parts of density, higher order gradients of density, and adding some percentage of Hartree–Fock exchange to the functional on the prediction of geometrical parameters were investigated. A copper complex namely 1,2-bis(1,4,7-triaza-1-cyclononyl) ethane copper (II) with Jahn–Teller distortion in octahedral geometry was used to evaluate the performance of 50 commonly available density functionals. The standard 3-21G basis set was used for all light elements, while pseudo potential LANL2DZ was used for the copper atom. The best bond lengths and bond angles were obtained using M05-2x and OP functionals respectively. Also in order to more accurate survey the performance of B3LYP, we used this functional with two all-electron basis sets (6-31G and 3-21G) and three basis sets involving effective core potentials (LANL2DZ/3-21G, LANL2DZ, and LACVP).
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Affiliation(s)
- JABER JAHANBIN SARDROODI
- Molecular Simulations Laboratory, Azarbaijan Shahid Madani University, BP 5375171379 Tabriz, Iran
| | - ALIREZA RASTKAR
- Molecular Simulations Laboratory, Azarbaijan Shahid Madani University, BP 5375171379 Tabriz, Iran
| | - NEGAR RAD YOUSEFNIA
- Molecular Simulations Laboratory, Azarbaijan Shahid Madani University, BP 5375171379 Tabriz, Iran
| | - JAFAR AZAMAT
- Molecular Simulations Laboratory, Azarbaijan Shahid Madani University, BP 5375171379 Tabriz, Iran
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Gerus A, Lis T. Poly[[μ-bis-(4-nitro-phen-yl) phosphato-κ(2) O,O']sodium]. Acta Crystallogr Sect E Struct Rep Online 2013; 69:m464-5. [PMID: 24109283 PMCID: PMC3793696 DOI: 10.1107/s1600536813019260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 07/11/2013] [Indexed: 11/10/2022]
Abstract
The title compound, [Na(C12H8N2O8P)], consists of one Na+ cation and one bis(p-nitrophenyl)phosphate anion with a considerable distortion of the phosphate tetrahedron due to the presence of two P—O ester bonds. The anion bridges five Na+ cations whereby each cation is chelated by the nitro O atoms of one anion and bonded via a nitro O atom and phosphate O atoms to four other anions. This bridging arrangement leads to the formation of double layers parallel to (001). Adjacent layers are linked through weak C—H⋯O hydrogen bonds.
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Affiliation(s)
- Aleksandra Gerus
- University of Wroclaw, Faculty of Chemistry, 14 Joliot-Curie St, 50-383 Wroclaw, Poland
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Dehghanpour S, Asadizadeh S, Assoud J. Dinuclear Five-Coordinate Copper(II) Complexes with Chelating Diphosphonic Acid Ligands: Hydrothermal Synthesis, Structure, and Thermal Properties. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201100495] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Dhanalakshmi T, Loganathan R, Suresh E, Stoeckli-Evans H, Palaniandavar M. Interaction of copper(II) complexes with bis(p-nitrophenyl)phosphate: Structural and spectral studies. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zeng Z, Torriero AAJ, Bond AM, Spiccia L. Fluorescent and electrochemical sensing of polyphosphate nucleotides by ferrocene functionalised with two Zn(II)(TACN)(pyrene) complexes. Chemistry 2010; 16:9154-63. [PMID: 20623565 DOI: 10.1002/chem.201000882] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The [Fc-bis{Zn(II)(TACN)(Py)}] complex, comprising two Zn(II)(TACN) ligands (Fc=ferrocene; Py=pyrene; TACN=1,4,7-triazacyclononane) bearing fluorescent pyrene chromophores linked by an electrochemically active ferrocene molecule has been synthesised in high yield through a multistep procedure. In the absence of the polyphosphate guest molecules, very weak excimer emission was observed, indicating that the two pyrene-bearing Zn(II)(TACN) units are arranged in a trans-like configuration with respect to the ferrocene bridging unit. Binding of a variety of polyphosphate anionic guests (PPi and nucleotides di- and triphosphate) promotes the interaction between pyrene units and results in an enhancement in excimer emission. Investigations of phosphate binding by (31)P NMR spectroscopy, fluorescence and electrochemical techniques confirmed a 1:1 stoichiometry for the binding of PPi and nucleotide polyphosphate anions to the bis(Zn(II)(TACN)) moiety of [Fc-bis{Zn(II)(TACN)(Py)}] and indicated that binding induces a trans to cis configuration rearrangement of the bis(Zn(II)(TACN)) complexes that is responsible for the enhancement of the pyrene excimer emission. Pyrophosphate was concluded to have the strongest affinity to [Fc-bis{Zn(II)(TACN)(Py)}] among the anions tested based on a six-fold fluorescence enhancement and 0.1 V negative shift in the potential of the ferrocene/ferrocenium couple. The binding constant for a variety of polyphosphate anions was determined from the change in the intensity of pyrene excimer emission with polyphosphate concentration, measured at 475 nm in CH(3)CN/Tris-HCl (1:9) buffer solution (10.0 mM, pH 7.4). These measurements confirmed that pyrophosphate binds more strongly (K(b)=(4.45+/-0.41) x 10(6) M(-1)) than the other nucleotide di- and triphosphates (K(b)=1-50 x 10(5) M(-1)) tested.
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Affiliation(s)
- Zhanghua Zeng
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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Murugavel R, Kuppuswamy S, Gogoi N, Steiner A. Assembling Discrete D4R Zeolite SBUs through Noncovalent Interactions. 3. Mediation by Butanols and 1,2-Bis(dimethylamino)ethane. Inorg Chem 2010; 49:2153-62. [DOI: 10.1021/ic901932r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ramaswamy Murugavel
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
| | - Subramaniam Kuppuswamy
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
| | - Nayanmoni Gogoi
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
| | - Alexander Steiner
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
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Murugavel R, Kuppuswamy S, Gogoi N, Boomishankar R, Steiner A. Noncovalent Synthesis of Hierarchical Zinc Phosphates from a Single Zn4O12P4Double-Four-Ring Building Block: Dimensionality Control through the Choice of Auxiliary Ligands. Chemistry 2009; 16:994-1009. [DOI: 10.1002/chem.200901994] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Synthesis, Characterization, and Crystal Structures of Novel Coordination Polymers of Praseodymium(III) and Neodymium(III) Containing Dialkyl Phosphate. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.2.489] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Murugavel R, Kuppuswamy S, Maity AN, Singh MP. Di-, Tri-, Tetra-, and Hexanuclear Copper(II) Mono-organophosphates: Structure and Nuclearity Dependence on the Choice of Phosphorus Substituents and Auxiliary N-Donor Ligands. Inorg Chem 2008; 48:183-92. [DOI: 10.1021/ic801532y] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Ramaswamy Murugavel
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
| | - Subramaniam Kuppuswamy
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
| | - Amarendra Nath Maity
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
| | - Mayank Pratap Singh
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
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D'Souza L, Devi P, Divya Shridhar M, Naik CG. Use of Fourier Transform Infrared (FTIR) Spectroscopy to Study Cadmium-Induced Changes in Padina Tetrastromatica (Hauck). ANALYTICAL CHEMISTRY INSIGHTS 2008. [DOI: 10.4137/117739010800300001] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The aim of this study is to adopt the approach of metabolic fingerprinting through the use of Fourier Transform Infrared (FTIR) technique to understand changes in the chemical structure in Padina tetrastromatica (Hauck). The marine brown alga under study was grown in two different environmental conditions; in natural seawater ( P. tetrastromatica (c)) and in seawater suplemented with 50 ppm of cadmium ( P. tetrastromatica (t)) for a three-week period in the laboratory. The second derivative, IR specrum in the mid-infrared region (4000-400 cm-1) was used for discriminating and identifying various functional groups present in P. tetrastromatica (c). On exposure to Cd, P. tetrastromatica (t) accumulated 412 ppm of Cd and showed perturbation in the band structure in the mid-IR absorption region. Variation in spectral features of the IR bands of P. tetrastromatica (untreated and treated) suggests that cadmium ions bind to hydroxyl, amino, carbonyl and phosphoryl functionalities. This was attributable to the presence of the following specific bands. A band at 3666 cm-1 in untreated P. tetrastromatica (c) while a band at 3560 cm-1 in Cd-treated P. tetrastromatica (t) due to non bonded and bonded O-H respectively. Similarly, non bonded N-H for P. tetrastromatica (c) showed two bands at 3500 cm-1 and 3450 cm-1 due to the N-H stretching vibrations and a band at 1577cm-1 due to N-H bending vibrations, while an intense band at 3350 cm-1 due to bonded N-H stretching vibrations and at 1571 cm-1 due to bending vibrations was observed for Cd-treated P. tetrastromatica (t). Involvement of ester carbonyl group is characterized by the presence of a band at 1764 cm-1 in untreated P. tetrastromatica (c) while the Cd-treated P. tetrastromatica (t) showed the band at 1760 cm-1. The intensity of the band at 1710 cm-1 in the control samples decreased drastically after cadmium treatment indicating carbonyl of COOH to be involved in metal chelation. A band at 1224 cm-1 for untreated P. tetrastromatica ( c) and at 1220 cm-1 for Cd-treated P. tetrastromatica (t) is indicative of the involvement of phosphoryl group in metal binding. Several other such changes were also evident and discussed in this paper. Based on our observation, FTIR technique proves to be an efficient tool for detecting structural changes and probable binding sites induced by the presence of a metal pollutant, cadmium, in the marine environment.
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Affiliation(s)
- Lisette D'Souza
- Bioorganic Chemistry laboratory, National Institute of Oceanography, Dona Paula Goa, 403 004, India
| | - Prabha Devi
- Bioorganic Chemistry laboratory, National Institute of Oceanography, Dona Paula Goa, 403 004, India
| | - M.P. Divya Shridhar
- Bioorganic Chemistry laboratory, National Institute of Oceanography, Dona Paula Goa, 403 004, India
| | - Chandrakant G. Naik
- Bioorganic Chemistry laboratory, National Institute of Oceanography, Dona Paula Goa, 403 004, India
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Belousoff MJ, Graham B, Spiccia L. Copper(II) Complexes ofN-Methylated Derivatives ofortho- andmeta-Xylyl-Bridged Bis(1,4,7-triazacyclononane) Ligands: Synthesis, X-ray Structure and Reactivity as Artificial Nucleases. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800533] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Solid state conformational preferences in transition metal complexes double bridged by phosphate and related ligands. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.04.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Murugavel R, Choudhury A, Walawalkar MG, Pothiraja R, Rao CNR. Metal Complexes of Organophosphate Esters and Open-Framework Metal Phosphates: Synthesis, Structure, Transformations, and Applications. Chem Rev 2008; 108:3549-655. [DOI: 10.1021/cr000119q] [Citation(s) in RCA: 278] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- R. Murugavel
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - Amitava Choudhury
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - M. G. Walawalkar
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - R. Pothiraja
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - C. N. R. Rao
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
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26
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Murugavel R, Kuppuswamy S, Randoll S. Cooperative Binding of Phosphate Anion and a Neutral Nitrogen Donor to Alkaline-Earth Metal Ions. Investigation of Group 2 Metal−Organophosphate Interaction in the Absence and Presence of 1,10-Phenanthroline. Inorg Chem 2008; 47:6028-39. [DOI: 10.1021/ic8003239] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ramaswamy Murugavel
- Department of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
| | - Subramaniam Kuppuswamy
- Department of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
| | - Sören Randoll
- Department of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai 400076, India
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27
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Rafizadeh M, Amani V, Farajian H. Synthesis, Characterization, and Crystal Structures of a New Coordination Polymer of Manganese(II) Containing Dimethyl Phosphate. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200700149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Belousoff MJ, Battle AR, Graham B, Spiccia L. Syntheses, structures and hydrolytic properties of copper(II) complexes of asymmetrically N-functionalised 1,4,7-triazacyclononane ligands. Polyhedron 2007. [DOI: 10.1016/j.poly.2006.06.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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29
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Meyer F. Clues to Dimetallohydrolase Mechanisms from Studies on Pyrazolate‐Based Bioinspired Dizinc Complexes – Experimental Evidence for a Functional Zn–O
2
H
3
–Zn Motif. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600590] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Franc Meyer
- Institut für Anorganische Chemie, Georg‐August‐Universität Göttingen Tammannstrasse 4, 37077 Göttingen, Germany, Fax: +49‐551‐393063
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30
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Rafizadeh M, Tayebee R, Amani V, Nasseh M. Crystal structure and molecular stereochemistry of polymeric Cu2(DMP)4(DMSO) as a platform for phosphate diester binding. CRYSTAL RESEARCH AND TECHNOLOGY 2006. [DOI: 10.1002/crat.200510697] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Murugavel R, Kuppuswamy S, Boomishankar R, Steiner A. Hierarchical Structures Built from a Molecular Zinc Phosphate Core. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601704] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Murugavel R, Kuppuswamy S, Boomishankar R, Steiner A. Hierarchical Structures Built from a Molecular Zinc Phosphate Core. Angew Chem Int Ed Engl 2006; 45:5536-40. [PMID: 16847980 DOI: 10.1002/anie.200601704] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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A trinuclear cobalt(III) phosphate complex with a novel molecular structure: Synthesis and crystal structure of {[Co(en)2]3(PO4)(HPO4)}2(H2PO4)Cl7·6H2O. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Kato M, Sah AK, Tanase T, Mikuriya M. Tetranuclear Copper(II) Complexes Bridged by α-d-Glucose-1-Phosphate and Incorporation of Sugar Acids through the Cu4 Core Structural Changes. Inorg Chem 2006; 45:6646-60. [PMID: 16903719 DOI: 10.1021/ic060202h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tetranuclear copper(II) complexes containing alpha-D-glucose-1-phosphate (alpha-D-Glc-1P), [Cu4(mu-OH){mu-(alpha-D-Glc-1P)}2(bpy)4(H2O)2]X3 [X = NO3 (1a), Cl (1b), Br (1c)], and [Cu4(mu-OH){mu-(alpha-D-Glc-1P)}2(phen)4(H2O)2](NO3)3 (2) were prepared by reacting the copper(II) salt with Na2[alpha-D-Glc-1P] in the presence of diimine ancillary ligands, and the structure of 2 was characterized by X-ray crystallography to comprise four {Cu(phen)}2+ fragments connected by the two sugar phosphate dianions in 1,3-O,O' and 1,1-O mu4-bridging fashion as well as a mu-hydroxo anion. The crystal structure of 2 involves two chemically independent complex cations in which the C2 enantiomeric structure for the trapezoidal tetracopper(II) framework is switched according to the orientation of the alpha-D-glucopyranosyl moieties. Temperature-dependent magnetic susceptibility data of 1a indicated that antiferromagnetic spin coupling is operative between the two metal ions joined by the hydroxo bridge (J = -52 cm(-1)) while antiferromagnetic interaction through the Cu-O-Cu sugar phosphate bridges is weak (J = -13 cm(-1)). Complex 1a readily reacted with carboxylic acids to afford the tetranuclear copper(II) complexes, [Cu4{mu-(alpha-D-Glc-1P)}2(mu-CA)2(bpy)4](NO3)2 [CA = CH3COO (3), o-C6H4(COO)(COOH) (4)]. Reactions with m-phenylenediacetic acid [m-C6H4(CH2COOH)2] also gave the discrete tetracopper(II) cationic complex [Cu4{mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)(CH2COOH))2(bpy)4](NO3)2 (5a) as well as the cluster polymer formulated as {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)2)(bpy)4](NO3)2}n (5b). The tetracopper structure of 1a is converted into a symmetrical rectangular core in complexes 3, 4, and 5b, where the hydroxo bridge is dissociated and, instead, two carboxylate anions bridge another pair of Cu(II) ions in a 1,1-O monodentate fashion. The similar reactions were applied to incorporate sugar acids onto the tetranuclear copper(II) centers. Reactions of 1a with delta-D-gluconolactone, D-glucuronic acid, or D-glucaric acid in dimethylformamide resulted in the formation of discrete tetracopper complexes with sugar acids, [Cu4{mu-(alpha-D-Glc-1P)}2(mu-SA)2(bpy)4](NO3)2 [SA = D-gluconate (6), D-glucuronate (7), D-glucarateH (8a)]. The structures of 6 and 7 were determined by X-ray crystallography to be almost identical with that of 3 with additional chelating coordination of the C-2 hydroxyl group of D-gluconate moieties (6) or the C-5 cyclic O atom of D-glucuronate units (7). Those with D-glucaric acid and D-lactobionic acid afforded chiral one-dimensional polymers, {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-D-glucarate)(bpy)4](NO3)2}n (8b) and {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-D-lactobionate)(bpy)4(H2O)2](NO3)3}n (9), respectively, in which the D-Glc-1P-bridged tetracopper(II) units are connected by sugar acid moieties through the C-1 and C-6 carboxylate O atoms in 8b and the C-1 carboxylate and C-6 alkoxy O atoms of the gluconate chain in 9. When complex 7 containing d-glucuronate moieties was heated in water, the mononuclear copper(II) complex with 2-dihydroxy malonate, [Cu(mu-O2CC(OH)2CO2)(bpy)] (10), and the dicopper(II) complex with oxalate, [Cu2(mu-C2O4)(bpy)2(H2O)2](NO3)2 (11), were obtained as a result of oxidative degradation of the carbohydrates through C-C bond cleavage reactions.
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Affiliation(s)
- Merii Kato
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-higashi-machi, Nara 630-8285, Japan
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35
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Kato M, Tanase T, Mikuriya M. Dinuclear Copper(II) Complexes with {Cu2(μ-hydroxo)bis(μ-carboxylato)}+ Cores and Their Reactions with Sugar Phosphate Esters: A Substrate Binding Model of Fructose-1,6-bisphosphatase. Inorg Chem 2006; 45:2925-41. [PMID: 16562948 DOI: 10.1021/ic051942d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reactions of CuX2.nH2O with the biscarboxylate ligand XDK (H2XDK = m-xylenediamine bis(Kemp's triacid imide)) in the presence of N-donor auxiliary ligands yielded a series of dicopper(II) complexes, [Cu2(mu-OH)(XDK)(L)2]X (L = N,N,N',N'-tetramethylethylenediamine (tetmen), X = NO3 (1a), Cl (1b); L = N,N,N'-trimethylethylenediamine (tmen), X = NO3 (2a), Cl (2b); L =2,2'-bipyridine (bpy), X = NO3 (3); L = 1,10-phenanthroline (phen), X = NO3 (4); L = 4,4'-dimethyl-2,2'-bipyridine (Me2bpy), X = NO3 (5); L = 4-methyl-1,10-phenanthroline (Mephen), X = NO3 (6)). Complexes 1-6 were characterized by X-ray crystallography (Cu...Cu = 3.1624(6)-3.2910(4) A), and the electrochemical and magnetic properties were also examined. Complexes 3 and 4 readily reacted with diphenyl phosphoric acid (HDPP) or bis(4-nitrophenyl) phosphoric acid (HBNPP) to give [Cu2(mu-phosphate)(XDK)(L)2]NO3 (L = bpy, phosphate = DPP (11); L = phen, phosphate = DPP (12), BNPP (13)), where the phsophate diester bridges the two copper ions in a mu-1,3-O,O' bidentate fashion (Cu...Cu = 4.268(3)-4.315(1) A). Complexes 4 and 6 with phen and Mephen have proven to be good precursors to accommodate a series of sugar monophosphate esters (Sugar-P) onto the biscarboxylate-bridged dicopper centers, yielding [Cu2(mu-Sugar-P)(XDK)(L)2] (Sugar-P = alpha-D-Glc-1-P (23a and b), D-Glc-6-P (24a and b), D-Man-6-P (25a), D-Fru-6-P (26a and b); L = phen (a), Mephen (b)) and [Cu2(mu-Gly-n-P)(XDK)(Mephen)2] (Gly-n-P = glycerol n-phosphate; n = 2 (21), 3 (22)), where Glc, Man, and Fru are glucose, mannose, and fructose, respectively. The structure of [Cu2(mu-MNPP)(XDK)(phen)2(CH3OH)] (20) was characterized as a reference compound (H2MNPP = 4-nitrophenyl phosphoric acid). Complexes 4 and 6 also reacted with d-fructose 1,6-bisphosphate (D-Fru-1,6-P2) to afford the tetranuclear copper(II) complexes formulated as [Cu4(mu-D-Fru-1,6-P2)(XDK)2(L)4] (L = phen (27a), Mephen (27b)). The detailed structure of 27a was determined by X-ray crystallography to involve two different tetranuclear complexes with alpha- and beta-anomers of D-Fru-1,6-P2, [Cu4(mu-alpha-D-Fru-1,6-P2)(XDK)2(phen)4] and [Cu4(mu-beta-D-Fru-1,6-P2)(XDK)2(phen)4], in which the D-Fru-1,6-P2 tetravalent anion bridges the two [Cu2(XDK)(phen)2]2+ units through the C1 and C6 phosphate groups in a mu-1,3-O,O' bidentate fashion (Cu...Cu = 4.042(2)-4.100(2) A). Notably, the structure with alpha-D-Fru-1,6-P2 demonstrated the presence of a strong hydrogen bond between the C2 hydroxyl group and the C1 phosphate oxygen atom, which may support the previously proposed catalytic mechanism in the active site of fructose-1,6-bisphosphatase.
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Affiliation(s)
- Merii Kato
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-higashi-machi, Nara 630-8285, Japan
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Schiller A, Scopelliti R, Severin K. Enhanced hydrolytic activity of Cu(ii) and Zn(ii) complexes in highly cross-linked polymers. Dalton Trans 2006:3858-67. [PMID: 16896445 DOI: 10.1039/b605676h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chelate ligand tris[(1-vinylimidazol-2-yl)methyl]amine (5) was synthesized in five steps from commercially available starting materials. Upon reaction with ZnCl2 or CuCl2 in the presence of NH4PF6, the complexes [Zn5Cl]PF6 (6) and [Cu5Cl]PF6 (7) were obtained. The structure of both complexes was determined by single-crystal X-ray crystallography. Immobilization of 6 and 7 was achieved by co-polymerization with ethylene glycol dimethacrylate. The supported complexes P6-Zn and P7-Cu were found to be efficient catalysts for the hydrolysis of bis(p-nitrophenyl)phosphate (BNPP) at 50 degrees C. At pH 9.5, the heterogeneous catalyst P7-Cu was 56 times more active than the homogeneous catalyst 7. Partitioning effects, which increase the local concentration of BNPP in the polymer, are shown to contribute to the enhanced activity of the immobilized catalyst.
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Affiliation(s)
- Alexander Schiller
- Institut des Sciences et Ingénieries Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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Bazzicalupi C, Bencini A, Bianchi A, Borsari L, Danesi A, Giorgi C, Mariani P, Pina F, Santarelli S, Valtancoli B. Coordination features of a terpyridine-containing polyamine receptor. Effect of protonation on the photophysical properties of the complexes. Dalton Trans 2006:5743-52. [PMID: 17146539 DOI: 10.1039/b609462g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the new terpyridine-containing macrocycle 2,6,10,14-tetraaza[15](6,6'')cyclo(2,2':6',2'')terpyridinophane (L) is reported. The ligand contains a tetraamine chain linking the 6,6'' positions of a terpyridine unit. A potentiometric, (1)H NMR, UV-vis spectrophotometric and fluorescence emission study on the basicity properties of in aqueous solutions shows that the first four protonation steps occur on the polyamine chain, while the terpyridine nitrogens are involved in proton binding only in the last protonation step at strongly acidic pH values. Cu(II), Zn(II), Cd(II) and Pb(II) complexation was studied in aqueous solution by means of potentiometric, spectrophotometric and spectrofluorimetric measurements. Cu(II) and Zn(II) can form both mono- and dinuclear complexes in solution, while the larger Cd(II) and Pb(II) give only mononuclear complexes. In the [ML](2+) complexes (M = Zn(II) or Cd(II)) the metal is unequivocally bound to the terpyridine unit. Some amine groups are not coordinated and can quench the fluorescence emission of the terpyridine unit thanks to an electron transfer process. Protonation of the unbound amine groups inhibits the eT process, affording fluorescent [MLH(x)]((2+x)+) complexes.
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Affiliation(s)
- Carla Bazzicalupi
- Dipartimento di Chimica, Polo Scientifico, Università di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
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Crystal Structure and Molecular Stereochemistry of Novel Polymeric Cu2(DMP)44(DMSO) as a Platform for Phosphate Diester Binding. B KOREAN CHEM SOC 2005. [DOI: 10.5012/bkcs.2005.26.4.594] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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39
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Fry FH, Fischmann AJ, Belousoff MJ, Spiccia L, Brügger J. Kinetics and Mechanism of Hydrolysis of a Model Phosphate Diester by [Cu(Me3tacn)(OH2)2]2+ (Me3tacn = 1,4,7-Trimethyl-1,4,7-triazacyclononane). Inorg Chem 2005; 44:941-50. [PMID: 15859272 DOI: 10.1021/ic049469b] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The kinetics of hydrolysis of bis(p-nitrophenyl)phosphate (BNPP) by [Cu(Me3tacn)(OH2)2]2+ has been studied by spectrophotometrical monitoring of the release of the p-nitrophenylate ion from BNPP. The reaction was followed for up to 8000 min at constant BNPP concentration (15 microM) and ionic strength (0.15 M) and variable concentration of complex (1.0-7.5 mM) and temperature (42.5-65.0 degrees C). Biphasic kinetic traces were observed, indicating that the complex promotes the cleavage of BNPP to NPP [(p-nitrophenyl)phosphate] and then cleavage of the latter to phosphate, the two processes differing in rate by 50-100-fold. Analysis of the more amenable cleavage of BNPP revealed that the rate of BNPP cleavage is among the highest measured for mononuclear copper(II) complexes and is slightly higher than that reported for the close analogue [Cu(iPr3tacn)(OH2)2]2+. Detailed analysis required the determination of the pKa for [Cu(Me3tacn)(OH2)2]2+ and the constant for the dimerization of the conjugate base to [(Me3tacn)Cu(OH)2Cu(Me3tacn)]2+ (Kdim). Thermodynamic parameters derived from spectrophotometric pH titration and the analysis of the kinetic data were in reasonable agreement. Second-order rate constants for cleavage of BNPP by [Cu(Me3tacn)(OH2)(OH)]+ and associated activation parameters were obtained from initial rate analysis (k = 0.065 M(-1) s(-1) at 50.0 degrees C, deltaH = 56+/-6 kJ mol(-1), deltaS = -95+/-18 J K(-1) mol(-1)) and biphasic kinetic analysis (k = 0.14 M(-1) s(-1) at 50.0 degrees C, deltaH = 55+/-6 kJ mol(-1), deltaS = -92+/-20 J K(-1) mol(-1)). The negative entropy of activation is consistent with a concerted mechanism with considerable associative character. The complex was found to catalyze the cleavage of BNPP with turnover rates of up to 1 per day. Although these turnover rates can be considered low from an application point of view, the ability of the complexes to catalyze phosphate ester cleavage is clearly demonstrated.
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Affiliation(s)
- Fiona H Fry
- School of Chemistry, Monash University, Victoria 3800, Australia
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Itoh M, Nakazawa J, Maeda K, Kano K, Mizutani T, Kodera M. Copper(II) Complexes of a Series of Polypyridine Ligands Possessing a 1,2-Bis(2-pyridyl)ethane Common Moiety: Incorporation and Hydrolysis of Phosphate Esters. Inorg Chem 2005; 44:691-702. [PMID: 15679404 DOI: 10.1021/ic049240w] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two tetradentate ligands 1,2-bis[2-((dimethylamino)methyl)-6-pyridyl]ethane (L1) and 1,2-bis[2-(N-piperidinomethyl)-6-pyridyl]ethane (L2) and a hexadentate ligand 1,2-bis(2-((methyl(pyridylmethyl)amino)methyl)-6-pyridyl)ethane (L3) were prepared as part of a series of new polypyridine ligands possessing a 1,2-bis(2-pyridyl)ethane common moiety. L1 and L2 form mononuclear Cu(II) complexes [Cu(L)(Cl)](ClO4) [L = L1 (1) and L2 (2)], respectively. L3 forms a dinuclear Cu(II) complex [Cu2(L3)((PhO)2PO2)2](ClO4)2 (3) or a hexanuclear Cu(II) complex [Cu6(L3)3((PhO)PO3)4](ClO4)4 (4) in the presence of (PhO)2PO2- monoanion or (PhO)PO3(2-) dianion, respectively. The structures of 1-4 were determined by X-ray analysis. The structures in solution were investigated by means of FAB and CSI MS spectrometers. The structural flexibility of the common 1,2-bis(2-pyridyl)ethane moiety and of the pendant groups allows complexes 1-4 to adapt to the various structures. Each Cu ion in 1 and 2 adopts a square pyramidal geometry with one Cl ion and two pendant groups (L1 and L2) binding in a bis-bidentate chelate mode. There is no steric repulsion between the pendant groups, so that the ligands specifically stabilize the mononuclear structures. L3 binds two Cu(II) ions with two pendant groups in tridentate chelate modes and, with the incorporation of phosphate esters, various dinuclear units are formed in 3 and 4. In 4, a dinuclear unit of [Cu2(L3)]4+ links two dinuclear units of [Cu2(L3)(PhOPO3)2] with four (mu3)-1,3-PhOPO3(2-) bridges. The hydrolytic activity of 2 and a dicopper(II) complex of L3 was examined with tris(p-nitrophenyl) phosphate (TNP) as a substrate.
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Affiliation(s)
- Motoharu Itoh
- Department of Molecular Science and Technology, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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Köhn RD, Pan Z, Haufe M, Kociok-Köhn G. Bis(triazacyclohexane) sandwich complexes of (CuI)2, CuII and ZnII: complexes with cuprophilic attraction between two cationic copper(i) leading to unusual reactivity with dioxygen. Dalton Trans 2005:2793-7. [PMID: 16075122 DOI: 10.1039/b501705j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As the first 1st-row transition metal complexes having six tertiary amine donor groups, bis(triazacyclohexane) sandwich complexes [L2M](BF4)2 (L = benzyl- or p-fluorobenzyl-triazacyclohexane, M = Cu or Zn) have been obtained by the protonolysis of Et2Zn in the presence of L or by reaction of [Cu(MeCN)4](BF4) with L in CH2Cl2 and subsequent air oxidation via an unprecedented Cu(I)(2) sandwich complex containing a short Cu-Cu contact.
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Affiliation(s)
- Randolf D Köhn
- Department of Chemistry, University of Bath, Bath, UK BA2 7AY.
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Vetrichelvan M, Lai YH, Mok K. 3,11,19-Trithia[3.3.3]pyridinophane: Structural Diversity in Its Transition Metal Complexes. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300835] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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