Syntheses,Structures,Magnetic And Photocatalyst Properties Of Co~? And Fe~? Complexes

Molecule-based magnets as popular materials in recent years,may be used in many fields,such as information storage,display devices,photocatalyst,which have received a lot of attention.At present,a lot of molecule-based magnets are complexes,the spin state of central metal atoms in the complexes determines the magnetic and other properties of complexes,which has a key effect on the application direction.Under the ligand field from ligand and cooperation environment provided by the counter ion and solvent,the central metal atoms likely perform as the spin state transition(under the outside stimulus such as temperature,light,pressure,and so on),completely high spin or totally low spin.Therefore,in order to get desired molecular magnetic materials,we need to choose the right central metal ions and ligand,and using the counter ion and the solvent molecules to build appropriate coordination environment,design and synthesis the complexes which have specific magnetic and other properties.In this paper,we designed and synthesized complexes in two systems.The first system is to choose the Co(?)as the central metal ions,4'-(thiazol-2-yl)-2,2':6',2'-'terpyridine(thiazole-terpy)as ligand,using anionic such as ClO4-PF6-and BF4-to regulate the magnetic,got a series of zero dimension complexes 1-3 with spin crossover characteristics,and detected their crystal structure and magnetism,testing,analyzed the effects of counter anion of complexes to the magnetism,summed up the link between structure of the complexes and magnetism,studied the impact of different anions on the spin crossover behavior of complexes.Another system was based on Fe(?)as the central metal atoms of complexes,N4Py(N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine)as ligand,two Fe(?)was connected by K2[M(CN)4](M=Pd,Pt),forming two zero dimension and dinuclear complexes 4 and 5.Testing their crystal structure and magnetism,the results showed that compound 4 and 5 were antiferromagnet,and the central metal atoms Fe(?)were at low spin states.The uv-vis spectra show that metal to ligand charge transfer(MLCT)exist in the molecures,in the photocatalytic reduction of carbon dioxide can be used as a catalyst to produce CO,H2 and CH4.