The Crystal Structures of Et2Sn(O2PMe2)2 and Ph2Sn(O2PMe2)2; Synthesis and Spectral Studies of Ph2Sn(O2PMe2)2

Abstract

Abstract Ph2Sn(O2PMe2)2 has been synthesized by the reaction of HO2PMe2 with Ph2SnO in toluene or by treating HO2PMe2 with Ph2SnCl2 in methanol. X-ray diffraction studies of Et2Sn(O2PMe2)2 and Ph2Sn(O2PMe2)2 show that the O2PMe2 ligands function as bidentate bridges between the tin atoms. The ethyl and the phenyl groups are in trans-position in the resulting octahedral environment around tin. Et2Sn(O2PMe2)2 crystallizes in the monoclinic space group P21/n (a = 817.11(9), b = 974.1(1), c = 970.1(1) pm, β = 113.749(6)°, Z = 2 and R = 0.032) and con­sists of a polymeric layer structure with centrosymmetric (SnOPO)4 sixteen-membered rings. Ph2Sn(O2PMe2)2 also crystallizes monoclinically in the space group P21/n (a= 1060.9(1), b = 999.4 (1), c = 1768.9(2) pm, β = 90.93(1)°, Z = 4 and R = 0.057) and has a polymeric ring-chain structure with centrosymmetric (SnOPO)2 eight-membered rings. The IR and Raman spectra of Ph2Sn(O2PMe2)2 have been assigned and discussed in the light of structural information. The Sn(O2PMe2)+ ion represents the base peak in the mass spectrum of Ph2Sn(O2Me2)2.