The rational syntheses of manganese-chloranilate compounds: crystal structures and magnetic properies

摘要

[Mn(CA)(terpy)]_n (1) and {[Mn(CA)(biopym)_(0.5)(H_2O)](H_2O)(C_2H_5OH)}_n (2) (H_2CA = chloranilic acid, terpy = 2,2':6'2''-terpyridine and bipym = 2,2'-biopyrimidine) have been synthesized and their crystal structures determined by a single-crystal X-ray diffraction. Compound 1 is made up of infinite chains of chloranilate-bridged manganese(II), affording a zig-zag pattern, with terpyridine ligands stacking between the chains. Compound 2 has a novel honeycomb layered structure, where each hexagon consists of six Mn(II) ions, four CA~(2-) and two bipym ligands. Mn(II) ions in both compounds are unusually hepta-coordinated. Magnetic susceptibility measurements of both compounds show weak antiferromagnetic coupling between the nearest Mn(II) ions.