Syntheses, crystal structures and properties of Co(II) complexes with N,N '-bis(3-pyridylmethyl)-1,4-benzenedi methyleneimine (bpb), and Cd(II), Hg(II) complexes with reduced bpb

摘要

Five novel coordination polymers, [Co(bpb)(2)Cl-2] (1), [Co(bpb)2(SCN)(2)] (2), [Cd(H(4)bpb)(0.5)(dmf)(NO3)2] (3), [Cd-2(H(4)bpb)Br-4] (4), and [Hg-2(H(4)bpb)I-4] (5) [bpb = N,N'-bis(3 -pyridylmethyl)-1,4-benzenedimethyleneimine, H(4)bpb=N,N'-bis(3-pyridylmethyl)-1,4-benzenedimethylamine], were synthesized and their structures were determined by X-ray crystallography. In the solid state, complex 1 is a 1D hinged chain, while 2 has 2D network structure with the ligand bpb serving as a bridging ligand using its two pyridyl N atoms. The imine N atoms keep free of coordination and bpb acts as a bidentate ligand in both 1 and 2. Complexes 3, 4, and 5 with reduced bpb ligand, i.e. H(4)bpb, show similar 2D network structure, in which ligand H(4)bpb serves as a tetradentate ligand. Thermogravimetric analyses for complexes 1-5 were carried out and found that they have high thermal stability. The magnetic susceptibilities of compounds 1, 2 were measured over a temperature range of 75-300 K. (C) 2004 Elsevier Inc. All rights reserved.