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Moneo-Corcuera A, Pato-Doldan B, Sánchez-Molina I, Nieto-Castro D, Galán-Mascarós JR. Crystal Structure and Magnetic Properties of Trinuclear Transition Metal Complexes (Mn II, Co II, Ni II and Cu II) with Bridging Sulfonate-Functionalized 1,2,4-Triazole Derivatives. Molecules 2021; 26:molecules26196020. [PMID: 34641564 PMCID: PMC8512707 DOI: 10.3390/molecules26196020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/28/2021] [Accepted: 10/02/2021] [Indexed: 11/26/2022] Open
Abstract
Here we present the synthesis, structure and magnetic properties of complexes of general formula (Mn)(Me2NH2)4][Mn3(μ-L)6(H2O)6] and (Me2NH2)6[M3(μ-L)6(H2O)6] (M = CoII, NiII and CuII); L−2 = 4-(1,2,4-triazol-4-yl) ethanedisulfonate). The trinuclear polyanions were isolated as dimethylammonium salts, and their crystal structures determined by single crystal and powder X-ray diffraction data. The polyanionic part of these salts have the same molecular structure, which consists of a linear array of metal(II) ions linked by triple N1-N2-triazole bridges. In turn, the composition and crystal packing of the MnII salt differs from the rest of the complexes (with six dimethyl ammonia as countercations) in containing one Mn+2 and four dimethyl ammonia as countercations. Magnetic data indicate dominant intramolecular antiferromagnetic interactions stabilizing a paramagnetic ground state. Susceptibility data have been successfully modeled with a simple isotropic Hamiltonian for a centrosymmetric linear trimer, H = −2J (S1S2 + S2S3) with super-exchange parameters J = −0.4 K for MnII, −7.5 K for NiII and −45 K for CuII complex. The magnetic properties of these complexes and their easy processing opens unique possibilities for their incorporation as magnetic molecular probes into such hybrid materials as magnetic/conducting multifunctional materials or as dopant for organic conducting polymers.
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Affiliation(s)
- Andrea Moneo-Corcuera
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain; (B.P.-D.); (I.S.-M.); (D.N.-C.)
- Correspondence: (A.M.-C.); (J.R.G.-M.)
| | - Breogán Pato-Doldan
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain; (B.P.-D.); (I.S.-M.); (D.N.-C.)
| | - Irene Sánchez-Molina
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain; (B.P.-D.); (I.S.-M.); (D.N.-C.)
| | - David Nieto-Castro
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain; (B.P.-D.); (I.S.-M.); (D.N.-C.)
- Departament de Química Física I Inorgànica, Universitat Rovira I Virgili, C/Marcel·lí Domingo, 43007 Tarragona, Spain
| | - José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain; (B.P.-D.); (I.S.-M.); (D.N.-C.)
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
- Correspondence: (A.M.-C.); (J.R.G.-M.)
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Mautner FA, Traber M, Fischer RC, Torvisco A, Reichmann K, Speed S, Vicente R, Massoud SS. Synthesis and structural characterization of isothiocyanato-4-methoxypyridine-cobalt(II) complexes with diverse geometries and a bridged 1D coordination polymer showing metamagnetic transition. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Synthesis, structural characterization and magnetic properties of Mn(II) isothiocyanate complexes based on pyridine-N-oxide derivative co-ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.11.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Coordination polymers of azido and thiocyanato Cd(II) and Zn(II) complexes based on 2,6-lutidine-N-oxide. Synthesis, characterization and luminescent properties. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.04.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mautner FA, Berger C, Fischer RC, Massoud SS. Synthesis, characterization and luminescent properties of polymeric cadmium(II) bridged-thiocyanato and mononuclear thiocyanato-zinc(II) complexes of pyridine-N-oxide derivatives. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.03.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Castro I, Barros WP, Calatayud ML, Lloret F, Marino N, De Munno G, Stumpf HO, Ruiz-García R, Julve M. Dicopper(II) pyrazolenophanes: Ligand effects on their structures and magnetic properties. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.02.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nugent JW, Lee HS, Reibenspies JH, Hancock RD. Spectroscopic, structural, and thermodynamic aspects of the stereochemically active lone pair on lead(II): Structure of the lead(II) dota complex. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Synthesis, characterization and luminescence properties of zinc(II) complexes of pseudohalides and nitrite derived from 4-azidopyridine. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.10.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mautner FA, Scherzer M, Berger C, Fischer RC, Vicente R, Massoud SS. Synthesis and characterization of five new thiocyanato- and cyanato-metal(II) complexes with 4-azidopyridine as co-ligand. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Massoud SS, Dubin M, Guilbeau AE, Spell M, Vicente R, Wilfling P, Fischer RC, Mautner FA. Azido- and thiocyanato-cobalt(II) complexes based pyrazole ligands. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.04.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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11
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Golbedaghi R, Salehzadeh S, Khavasi HR, Blackman AG. Mn(II) complexes of three [2+2] macrocyclic Schiff base ligands. Synthesis and X-ray crystal structure of the first binuclear–di(binuclear) cocrystal. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.09.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Massoud SS, Guilbeau AE, Luong HT, Vicente R, Albering JH, Fischer RC, Mautner FA. Mononuclear, dinuclear and polymeric 1D thiocyanato- and dicyanamido–copper(II) complexes based on tridentate coligands. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.01.033] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Vigato P, Peruzzo V, Tamburini S. Acyclic and cyclic compartmental ligands: Recent results and perspectives. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.01.009] [Citation(s) in RCA: 167] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Structural characterization of five-coordinate copper(II), nickel(II), and cobalt(II) thiocyanato complexes derived from bis(2-(3,5-dimethyl-1-pyrazolyl)ethyl)amine. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.10.011] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Zhou H, Pan ZQ, Ni WH, Wei L, Huang QM. Coordination polymers of polyamine and macrocycles controlled by pyridine-containing arms. CrystEngComm 2012. [DOI: 10.1039/c2ce25547b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mautner FA, Albering JH, Harrelson EV, Gallo AA, Massoud SS. N-bonding vs. S-bonding in thiocyanato-copper(II) complexes. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.10.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Cameron SA, Brooker S. Metal-Free and Dicopper(II) Complexes of Schiff Base [2 + 2] Macrocycles Derived from 2,2′-Iminobisbenzaldehyde: Syntheses, Structures, and Electrochemistry. Inorg Chem 2011; 50:3697-706. [DOI: 10.1021/ic200059n] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Scott A. Cameron
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Sally Brooker
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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18
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Thiocyanato-copper(II) complexes derived from a tridentate amine ligand and from alanine. TRANSIT METAL CHEM 2010. [DOI: 10.1007/s11243-010-9371-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Kitchen JA, Brooker S. Two dicobalt(iii) complexes of triazolate-containing [2+2] Schiff-base macrocycles coordinate thiocyanate ions via the sulfur atom. Dalton Trans 2010; 39:3358-60. [DOI: 10.1039/b925745d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hui JKH, Yu Z, Mirfakhrai T, MacLachlan M. Supramolecular Assembly of Carbohydrate-Functionalized Salphen-Metal Complexes. Chemistry 2009; 15:13456-65. [DOI: 10.1002/chem.200902031] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Dehno Khalaji A, Weil M, Hadadzadeh H, Daryanavard M. Two different 1D-chains in the structures of the copper(I) coordination polymers based on bidentate Schiff-base building units and thiocyanate anions as bridging ligands. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.06.033] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Ding B, Liu YY, Zhao XJ, Yang EC, Du GX, Wang XG. Hydrothermal Synthesis and Characterization of a Novel Lead(II) Framework Containing Infinite Pb-O-Pb Linkage Extended by Novel Pb-μ1,1-(N)CS-Pb Bridges. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200801319] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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N,N-Dimethylethylenediamine in direct and direct template syntheses of Cu(II)/Cr(III) complexes. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.02.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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24
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Mautner FA, Louka FR, LeGuet T, Massoud SS. Pseudohalide copper(II) complexes derived from polypyridyl ligands: Synthesis and characterization. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.09.015] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Synthesis, structural characterization and antioxidant/anti-inflammatory activity of pentacoordinated bis(isoselenocyanato) and bis(isothiocyanato) CuII and NiII complexes with Me5dien: Crystal structure of [Cu(Me5dien)(NCSe)2]. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.09.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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26
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Brandt CD, Kitchen JA, Beckmann U, White NG, Jameson GB, Brooker S. Synthesis and Structures of 3,5-disubstituted 1,2,4-triazole Head Units and Incorporation of 3,5-dibenzoyl-1,2,4-triazolate into New [2 + 2] Schiff-Base Macrocyclic Complexes. Supramol Chem 2007. [DOI: 10.1080/10610270600902340] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Carsten D. Brandt
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin, New Zealand
| | - Jonathan A. Kitchen
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin, New Zealand
| | - Udo Beckmann
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin, New Zealand
| | - Nicholas G. White
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin, New Zealand
| | - Geoffrey B. Jameson
- b Institute of Fundamental Sciences, Chemistry, Massey University , PO Box 11222, Palmerston North, New Zealand
| | - Sally Brooker
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin, New Zealand
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Ding B, Huang YQ, Liu YY, Shi W, Cheng P. Synthesis, structure and magnetic properties of a novel 1D coordination polymer {[Cu2(amtrz)4(1,1-μ-NCS)2](ClO4)2·H2O}n. INORG CHEM COMMUN 2007. [DOI: 10.1016/j.inoche.2006.08.015] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Croucher PD, Klingele MH, Noble A, Brooker S. Tricopper(ii) complexes of unsymmetrical macrocycles incorporating phenol and pyridine moieties: the development of two stepwise routes. Dalton Trans 2007:4000-7. [PMID: 17828360 DOI: 10.1039/b707905b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two stepwise approaches to preparing large unsymmetrical macrocycles incorporating diethylenetriamine lateral units are described: the first utilises protecting group chemistry, whereas the second exploits irreversible amide bond formation in the presence of an excess of the amine. In the first approach condensation of two equivalents of N-acetyldiethylenetriamine 1 with 2,6-diformyl-4-methylphenol, followed by a sodium borohydride reduction of the newly formed imine bonds and acidic removal of the protecting groups, yields a phenol-containing "two-armed" precursor as an HCl salt 2. Using the second approach the new pyridine-containing "two-armed" precursor , is prepared from 2,6-dimethylpyridinedicarboxylate and an excess of diethylenetriamine. These two "two-armed" di-primary amine precursors, 2 (after reaction with KOH) and 3, can be condensed with the dicarbonyl head units of choice. The lead templated condensation of 2 with 2,6-diacetylpyridine results in the formation of the macrocyclic dilead(II) complex {[Pb(II)(2)(L1)(Cl)](ClO(4))(2)}(infinity) 4. Transmetallation of 4 with three equivalents of copper(II) perchlorate produces Cu(II)(3)(L1)(OH)(ClO(4))(4) 5. Condensation of 3 with 2,6-diacetylpyridine or 2,6-diformylpyridine in the presence of barium(ii) ions results in the macrocyclic complexes [Ba(II)(H(2)L2)](ClO(4))(2) 6 and [Ba(II)(H(2)L3)](ClO(4))(2) 7, respectively. Copper(II) acetate templates the formation of the crystallographically characterised unsymmetrical macrocyclic complex [Cu(II)(3)(L4)(OH)(NCS)(2)].EtOH, 8.EtOH, from 3, 2,6-diformyl-4-methylphenol and NaNCS.
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Affiliation(s)
- Paul D Croucher
- Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
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Aznar E, Ferrer S, Borrás J, Lloret F, Liu-González M, Rodríguez-Prieto H, García-Granda S. Coordinative Versatility of Guanazole [3,5-Diamino-1,2,4-triazole]: Synthesis, Crystal Structure, EPR, and Magnetic Properties of a Dinuclear and a Linear Trinuclear Copper(II) Complex Containing Small Bridges and Triazole Ligands. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600711] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Ma CTL, MacLachlan MJ. Supramolecular assembly and coordination-assisted deaggregation of multimetallic macrocycles. Angew Chem Int Ed Engl 2006; 44:4178-82. [PMID: 15942975 DOI: 10.1002/anie.200500058] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Cecily Tsz Lui Ma
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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The first discrete tetranuclear silver(I) complex containing 4-substituted (m-phenol)-1,2,4-triazole: Synthesis, structure and fluorescence. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.04.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Mautner FA, Vicente R, Massoud SS. Structure determination of nitrito- and thiocyanato-copper(II) complexes: X-ray structures of [Cu(Medpt)(ONO)(H2O)]ClO4 (1), [Cu(dien)(ONO)]ClO4 (2) and [Cu2(Medpt)2(μN,S-NCS)2](ClO4)2 (3) (Medpt=3,3′-diamino-N-methyldipropylamine and dien=diethylenetriamine). Polyhedron 2006. [DOI: 10.1016/j.poly.2005.11.008] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Klingele MH, Boyd PDW, Moubaraki B, Murray KS, Brooker S. Probing the Dinucleating Behaviour of a Bis-Bidentate Ligand: Synthesis and Characterisation of Some Di- and Mononuclear Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes of 3,5-Di(2-pyridyl)-4-(1H-pyrrol-1-yl)-4H-1,2,4-triazole. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200500972] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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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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Klingele MH, Moubaraki B, Murray KS, Brooker S. Synthesis and Some First-Row Transition-Metal Complexes of the 1,2,4-Triazole-Based Bis(terdentate) Ligands TsPMAT and PMAT. Chemistry 2005; 11:6962-73. [PMID: 16163767 DOI: 10.1002/chem.200500387] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The employment of a strategy based on nucleophilic substitution, rather than Schiff base condensation, for the preparation of 1,2,4-triazole-based ligands has been investigated and has led to the synthesis of two new ligands, 4-amino-3,5-bis{[N-(2-pyridylmethyl)-N-(4-toluenesulfonyl)amino]methyl}-4H-1,2,4-triazole (TsPMAT, 14) and 4-amino-3,5-bis{[(2-pyridylmethyl)amino]methyl}-4H-1,2,4-triazole (PMAT, 15). These are the first examples of bis(terdentate) ligands incorporating the 1,2,4-triazole unit. TsPMAT (14) forms a dinuclear 2:2 complex with Co(BF4)2.6 H2O even when reacted in a metal-to-ligand molar ratio of 2:1. Similarly, the reaction of PMAT (15) with Mn(ClO4)2.6H2O or M(BF4)2.6 H2O (M=Fe, Co, Ni, Zn) in a ligand-to-metal molar ratio of 1:1 has afforded a series of complexes with the general formula [M(II) (2)(PMAT)2]X4. The metal centres in these complexes of TsPMAT (14) and PMAT (15) are encapsulated by two ligand molecules and doubly bridged by the N2 units of the 1,2,4-triazole moieties, which gives rise to N6 coordination spheres that are strongly distorted from octahedral, as evidenced by the X-ray crystal structure analyses of [Co(II) (2)(TsPMAT)(2)](BF(4))(4)6 MeCN (246 MeCN) and [Fe(II) 2(PMAT)2](BF4)4DMF (27DMF). Studies of the magnetic properties of [Co(II) 2(TsPMAT)2](BF4)4.4 H2O (244 H2O), [Mn(II) 2(PMAT)2](ClO4)4 (26), and [Co(II) 2(PMAT)2](BF4)4 (28) have revealed weak antiferromagnetic coupling (J=-3.3, -0.16, and -2.4 cm(-1), respectively) between the two metal centres in these complexes.
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Affiliation(s)
- Marco H Klingele
- Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
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Ma CTL, MacLachlan MJ. Supramolecular Assembly and Coordination-Assisted Deaggregation of Multimetallic Macrocycles. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500058] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Huang YQ, Ding B, Gao HL, Cheng P, Liao DZ, Yan SP, Jiang ZH. Syntheses, structures and characterization of novel cobalt(II) mono- and bi-triazole complexes. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.03.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Klingele MH, Moubaraki B, Cashion JD, Murray KS, Brooker S. The first X-ray crystal structure determination of a dinuclear complex trapped in the [low spin–high spin] state: [FeII2(PMAT)2](BF4)4·DMF. Chem Commun (Camb) 2005:987-9. [PMID: 15719091 DOI: 10.1039/b415891a] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two metal centres in the doubly 1,2,4-triazole-bridged spin crossover complex [Fe(II)2(PMAT)2](BF4)4.DMF (1.DMF) are trapped in different spin states below ca. 200 K, with no evidence that this particular [LS-HS] species can be converted into the [LS-LS] form at ambient pressure.
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Affiliation(s)
- Marco H Klingele
- School of Chemistry, Monash University, Building 23, Clayton, Victoria 3800, Australia
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Klingele MH, Brooker S. Synthesis and X-ray crystal structure of a polymeric copper(II) complex containing the novel ligand 4,4′-(1,4-phenylene)bis[3-phenyl-5-(2-pyridyl)-4H-1,2,4-triazole]. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.11.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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