| Abstract |
Synthesis, molecular and supramolecular structures, electrochemistry and magnetic properties of two diphenoxo-bridged dicopper(II) compounds [(Cu2L)-L-II(H2O)(ClO4)]center dot ClO4 center dot 2H(2)O (1) and [(Cu2L)-L-II(N-3)(2)]center dot 2H(2)O (2) derived from a tetraimino diphenolate macrocyclic ligand H2L, obtained on [2+2] condensation of 4-methyl-2,6-diformylphenol and 2,2 -dimethyl-1,3-diaminopropane, are presented. Supramolecular structure of both 1 and 2 are three-dimensional resulting from hydrogen bonding interactions. Interestingly, the 3-D self-assembly of 2 contains micropores having the dimension of 0.35 nm. Electrochemical analyses reveal that both of these compounds exhibit two-step couples in the reduction window. Variable-temperature (2-300 K) magnetic susceptibilities measurements of the two compounds reveal that the metal centers in both of the complexes are coupled by strong anti ferromagnetic interactions with J values (H = JS(1).S-2) -776 and -836 cm(-1) for 1 and 2, respectively. (C) 2009 Elsevier Ltd. All rights reserved. |
