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-HO(3)S-C(6)H(4)-AsO(3)H(2), H(3)L) afforded Mn(3)(L)(2)(H(2)O)(3).H(2)O (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).8.5H(2)O (2), Mn(HL)(phen)(2)(H(2)O).2H(2)O (3), [Mn(HL)(bipy)(2)]Mn(H(2)L)(bipy)(2).3H(2)O (4), [Mn(HL)(phen)][Mn(HL)(phen)(H(2)O)] (5), Mn(2)(HL)(phen)(4)(H(2)O)(2).4H(2)O (6), Mn(2)(HL)(phen)(4)(H(2)O)(2).H(2)O (7), Mn(2)(HL)(2)(bipy)(3)(H(2)O).H(2)O (8), Mn(HL)(terpy) (9), Mn(7)(OH)(2)(L)(4)(phen)(8).10H(2)O.phen (10), and Mn(HL)(bipy)(H(2)O).2H(2)O (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 Mn(2+) ions are bridged by one or two sulfonate-arsonate ligands. 10 exhibits an interesting heptanuclear cluster in which the Mn(2+) centers are bridged by arsonate, sulfonate groups and hydroxyl anions. 11 features a one-dimensional (1D) chain in which two neighboring Mn(2+) 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.