A Series of New Manganese(II) Sulfonate-Arsonates with 2D Layer, 1D Chain, and 0D Clusters Structures

Hydrothermal reactions of manganese(II) salts with o-sulfophenylarsonic acid (o-HO3S−C6H4−AsO3H2, H3L) afforded Mn3(L)2(H2O)3·H2O (1) with a layered structure. When 1,10-phenanthroline (phen), 2,2′-bipyridine (bipy), and 2,2′:6′,2′′-terpyridine (terpy) were used as auxiliary chelating ligands, a series of mixed-ligand manganese(II) sulfonate-arsonates with lower dimensional structures, namely, [Mn(HL)(phen)2]2·8.5H2O (2), Mn(HL)(phen)2(H2O)·2H2O (3), [Mn(HL)(bipy)2][Mn(H2L)(bipy)2](ClO4)·3H2O (4), [Mn(HL)(phen)][Mn(HL)(phen)(H2O)] (5), [Mn2(HL)(phen)4(H2O)](ClO4)2·4H2O (6), [Mn2(HL)(phen)4(H2O)](ClO4)2·H2O (7), Mn2(HL)2(bipy)3(H2O)·H2O (8), [Mn(HL)(terpy)]2 (9), Mn7(OH)2(L)4(phen)8·10H2O·phen (10), and Mn(HL)(bipy)(H2O)·2H2O (11) have been obtained. 2−4 are mononuclear (4 contains two different mononuclear cluster units) whereas 5−9 feature three types of isolated dinuclear cluster units in which the two Mn2+ ions are bridged by one or two sulfonate-arsonate ligands. 10 exhibits an interesting heptanuclear cluster in which the Mn2+ centers are bridged by arsonate, sulfonate groups and hydroxyl anions. 11 features a one-dimensional (1D) chain in which two neighboring Mn2+ centers are bridged by an arsonate group of a sulfonate-arsonate ligand. Magnetic measurements indicate that 1 exhibits an unprecedented spin topology and behaves as a homospin ferrimagnet whereas 2−4 are essentially paramagnetic. 5−9 and 11 are weakly antiferromagnetic.