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

Abstract Reaction of SmCl 3 ·6H 2 O with 3 equiv. of dihydroxodiphenylarsonium chloride [Ph 2 As(OH) 2 ]Cl resulted in the first structurally characterized lanthanide complex of organoarsinate [Sm(μ-O 2 AsPh 2 ) 3 ]. Single crystal X-ray diffraction reveals that this complex belongs to the trigonal system, \(R\bar{3}\) space group, with a  = 24.077(3) Å, b  = 24.077(3) Å, c  = 10.708(1) Å, β = 120°, V  = 5375.8(1) Å 3 and Z  = 6. This homoleptic compound features a 1D polymer arrangement in which two Sm atoms are bridged by three diphenylarsinate [Ph 2 AsO 2 ] – ligands under syn,syn μ 2 –η 1 :η 1 bridging mode. The coordination number of Sm center is 6, giving an almost perfect octahedron geometry. The antibacterial activity of [Sm(μ-O 2 AsPh 2 ) 3 ] is much weaker than the free ligand [Ph 2 As(OH) 2 ]Cl.