Synthesis, structure and magnetic properties of pyrazolate-bridged dinuclear complexes [{M(NCS)(4-Phpy)}2(μ-bpypz)2] (M = Co2+ and Fe2+)
摘要:
The synthesis and magnetic characterization of pyrazolato-bridged dinuclear complexes [{M(NCS)(4-Phpy)}(2)(mu-bpypz)(2)] (Hbpypz=3,5-bis(2-pyridyl)-pyrazole; 4-Phpy=4-phenylpyridine; M=CO2+ (1) and Fe2+ (2)) are described together with the X-ray crystal analysis of the cobalt complex. The structure of 1 shows that the desired coordination has been achieved with the cobalt atoms being coordinated to two bpypz to form the dimer. The X-ray diffraction patterns show 1 and 2 to be isomorphous at room temperature. 2 displays it single spin-crossover transition between the [HS-HS] and [LS-LS] states with T-c = 150 K. (c) 2005 Elsevier Ltd. All rights reserved.