Two Cu(II) Complexes Constructed from 5-Methylisophthalic Acid with Structurally Similar Dipyridyl Ligands.

Two complexes, [Cu2(mip)2(bpa)]n (1) and [Cu2(mip)2(dpe)]n (2) [H2mip [image omitted] 5-methylisophthalic acid; bpa [image omitted] 1,2-Bis(4-pyridyl)-ethane; dpe [image omitted] 1,2-Di(4-pyridyl)-ethylene], have been prepared by hydrothermal reactions of Cu(II) salt and 5-methylisophthalic acid system with structurally similar dipyridyl ligands and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray analysis. Their X-ray crystal structures show that both of the two complexes belong to the monoclinic system, P21/n space group, [image omitted] [image omitted] 7.9615(8) Å, [image omitted] [image omitted] 15.7148(17) Å, [image omitted] [image omitted] 11.7437(12) Å, [image omitted] [image omitted] 101.8880(10)○ and [image omitted] [image omitted] 7.9000(10) Å, [image omitted] [image omitted] 15.600(2) Å, [image omitted] [image omitted] 11.8063(15) Å, [image omitted] = 100.859(2)° for 1 and 2, respectively. The two complexes have 8-membered rings resulting from dimeric Cu(II) units bridged by tridentate H2mip ligands and further form two-dimensional layered structures, which are then extended into a 2-fold interpenetrating three-dimensional network through bpa and dpe co-ligands, respectively. Moreover, the magnetic properties of 1 are investigated and antiferromagnetic interactions are observed. [ABSTRACT FROM AUTHOR]