Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Quality Control of: Tris(2-pyridylmethyl)amine, Which mentioned a new discovery about 16858-01-8
Spin crossover of ferric complexes with catecholate derivatives. Single-crystal X-ray structure, Magnetic and Moessbauer investigations
Complexes of general formula [(TPA)Fe(R-Cat)]X¡¤nS were synthesised with different catecholate derivatives and anions (TPA = tris(2-pyridylmethyl) amine, R-Cat2- = 4,5-(NO2)2-Cat2- denoted DNC2-; 3,4,5,6-Cl4-Cat2- denoted TCC2-; 3-OMe-Cat2-; 4-Me-Cat2- and X = BPh 4-; NO3-; PF6 -; ClO4-; S = solvent molecule). Their magnetic behaviours in the solid state show a general feature along the series, viz., the occurrence of a thermally-induced spin crossover process. The transition curves are continuous with transition temperatures ranging from ca. 84 to 257 K. The crystal structures of [(TPA)Fe(DNC)]X (X = PF6-; BPh4-) and [(TPA)Fe(TCC)]X¡¤nS (X = PF 6-; NO3- and n = 1, S = H 2O; ClO4- and n= 1, S = H2O; BPh4- and n = 1, S = C3H6O) were solved at 100 (or 123 K) and 293 K. For those two systems, the characteristics of the [FeN4O2] coordination core and those of the dioxolene ligands appear to be consistent with a prevailing Fe III-catecholate formulation. This feature is in contrast with the large quantum mixing between FeIII-catecholate and Fe III-semiqumonate forms recently observed with the more electron donating simple catecholate dianion. The thermal spin crossover process is accompanied by significant changes of the molecular structures as shown by the average variation of the metal-ligand bond distances which can be extrapolated for a complete spin conversion from ca. 0.123 to 0.156 A. The different space groups were retained in the low- and high-temperature phases. The Royal Society of Chemistry 2005.
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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI