HOMOLEPTIC SAMARIUM(III) COMPLEX OF DIPHENYLARSINATE [Sm(μ-O2AsPh2)3]: CRYSTAL STRUCTURE AND ANTIBACTERIAL ACTIVITY EVALUATION.

Reaction of SmCl3·6H2O with 3 equiv. of dihydroxodiphenylarsonium chloride [Ph2As(OH)2]Cl resulted in the first structurally characterized lanthanide complex of organoarsinate [Sm(μ-O2AsPh2)3]. Single crystal X-ray diffraction reveals that this complex belongs to the trigonal system, space group, with a = 24.077(3) Å, b = 24.077(3) Å, c = 10.708(1) Å, β = 120°, V = 5375.8(1) Å3 and Z = 6. This homoleptic compound features a 1D polymer arrangement in which two Sm atoms are bridged by three diphenylarsinate [Ph2AsO2]– ligands under syn,syn μ2–η1:η1 bridging mode. The coordination number of Sm center is 6, giving an almost perfect octahedron geometry. The antibacterial activity of [Sm(μ-O2AsPh2)3] is much weaker than the free ligand [Ph2As(OH)2]Cl. [ABSTRACT FROM AUTHOR]