Coordination chemistry of 5,6,7-trimethyl-[1,2,4]triazolo[1,5-a]pyrimidine with first-row transition-metal salts: Synthesis, spectroscopy and single-crystal structures, with counter-anion dependence of the structures
| Autor: | Jan Reedijk, Yorrick van Bree, Eelke D. van den Bos, E. Gunay, Urho Turpeinen, Stefan van Oudheusden, Ilpo Mutikainen, J. Huub Adriaanse, Jaap G. Haasnoot, Sven H. C. Askes, Gerard A. van Albada |
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| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Coordination sphere Thiocyanate 010405 organic chemistry Ligand Coordination number Inorganic chemistry Crystal structure 010402 general chemistry 01 natural sciences 0104 chemical sciences Coordination complex Inorganic Chemistry Perchlorate chemistry.chemical_compound Crystallography chemistry Transition metal Materials Chemistry Physical and Theoretical Chemistry |
| Zdroj: | Polyhedron. 28:3143-3149 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2009.07.001 |
| Popis: | A variety of new coordination compounds with transition-metal salts and the ligand trimethyl-[1,2,4]triazolo[1,5-a]pyrimidine (abbreviated as tmtp) is described, together with several of their 3D crystal structures and spectroscopic and magnetic properties. The compounds were selected based on the coordination ability of the counterion, halide, nitrate, sulfate, thiocyanate and perchlorate. The formed coordination compounds and their coordination numbers were found to be strongly dependent on both the cation and the used counter-anion. The several compounds studied have the following structural formulae: [CuCl 2 (tmtp) 2 ], [CuBr 2 (tmtp) 2 ], [ZnBr 2 (tmtp) 2 ], [Cu(NO 3 ) 2 (tmtp) 2 ], [CuSO 4 (tmtp) 2 ] 2 (H 2 O)(MeOH), [Cu(H 2 O)(NCS) 2 (tmtp) 2 ], [Zn(NCS) 2 (tmtp) 2 ], [Cd(NCS) 2 (tmtp) 2 ] and [M(H 2 O) 2 (tmtp) 4 ](BF 4 ) 2 , in which M = Co, Ni, Zn. The new coordination compounds have been further characterized by NMR, (far-)IR and LF spectra, as well as by C, H, N element analyses, and EPR spectra for the Cu(II) compounds. The coordination around the metal varies from 4 (Zn, Cu), via 5 (Cu) to 6 (for Co, Cu and Cd). The anions usually complete the coordination sphere; only the Co and Zn compounds with the tetrafluoridoborate anions have no coordinated anions, but water ligands complete the octahedral coordination sphere. In the 5-coordinated [Cu(H 2 O)(NCS) 2 (tmtp) 2 ] water completes the square pyramid geometry. |
| Databáze: | OpenAIRE |
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