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

Abstract

Abstract Ph 2 Sn(O 2 PMe 2 ) 2 has been synthesized by the reaction of HO 2 PMe 2 with Ph 2 SnO in toluene or by treating HO 2 PMe 2 with Ph 2 SnCl 2 in methanol. X-ray diffraction studies of Et 2 Sn(O 2 PMe 2 ) 2 and Ph 2 Sn(O 2 PMe 2 ) 2 show that the O 2 PMe 2 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. Et 2 Sn(O 2 PMe 2 ) 2 crystallizes in the monoclinic space group P2 1 /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. Ph 2 Sn(O 2 PMe 2 ) 2 also crystallizes monoclinically in the space group P2 1 /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 Ph 2 Sn(O 2 PMe 2 ) 2 have been assigned and discussed in the light of structural information. The Sn(O 2 PMe 2 ) + ion represents the base peak in the mass spectrum of Ph 2 Sn(O 2 Me 2 ) 2 .