摘要 : Syntheses, molecular and supramolecular structures, and magnetic properties of a mononuclear manganese(II) compound [Mn-II (LH)(2)](ClO4)(2) (1) and a dicyanamide-bridged one-dimensional copper(II) compound [Cu-II(LH)(mu(1,5)-dca)... 展开 Syntheses, molecular and supramolecular structures, and magnetic properties of a mononuclear manganese(II) compound [Mn-II (LH)(2)](ClO4)(2) (1) and a dicyanamide-bridged one-dimensional copper(II) compound [Cu-II(LH)(mu(1,5)-dca)](n)(NO3)(n) (2) derived from enolic 4-terpyridone (LH) have been described. The compounds 1 and 2 crystallize in monoclinic P2(1)/n and triclinic P (1) over bar space groups, respectively, with the following unit cell parameters - 1: a = 8.8281(4) angstrom, b = 8.7736(4) angstrom, c = 39.7838(16) angstrom, beta = 95.719(1)degrees, and Z = 4; 2: a = 7.5342(3) angstrom, b = 8.9307(4) angstrom, c = 15.0189(8) angstrom, alpha = 73.0032(15)degrees, beta = 81.3701(16)degrees, gamma = 65.461(2)degrees, and Z = 2. In 1, the metal center is hexacoordinated by three pyridine nitrogens of each of the two enolic 4-terpyridones. In 2, the metal center is pentacoordinated by three pyridine nitrogens of 4-terpyridone and two nitrogens of two end-to-end (EE; mu(1,5)-) dicyanamide. The coordination geometries of 1 and 2 are distorted octahedral and distorted square pyramidal, respectively. Eight hydrogen bonds, six of C-H center dot center dot center dot O types and two of O-H center dot center dot center dot O types, link the complex cation [Mn-II(LH)(2)](2+) and two perchlorate anions into a three-dimensional network in 1. In the case of 2, seven hydrogen bonds, six of C-H center dot center dot center dot O types and one of O-H center dot center dot O type, link the dicyanamide-bridged one-dimensional chains into a two-dimensional sheet consisting of interlinked one-dimensional double-chains. It may be noted that O-H group of enolic 4-terpyridone participates in hydrogen bonding interactions and in developing extended structures in both 1 and 2. Variable-temperature (2-300 K) magnetic susceptibility measurements of both the compounds have been performed to understand the possibility of spin transition in 1 and exchange interaction in 2. However, the susceptibility data of 1 indicate the existence of high-spin manganese(II) throughout the temperature range. In the case of 2, copper(II) centers are noninteracting which is related to the highly distorted coordination geometry of the metal ion. (C) 2008 Elsevier Ltd. All rights reserved. 收起