Cd2+ complexation with P(CH2OH)3, OP(CH2OH)3, and (HOCH2)2PO2–: coordination in solution and coordination polymers
The coordination of Cd2+ with P(CH2OH)3 (THP) in methanol was followed by 31P and 113Cd NMR techniques. A cadmium-to-phosphine coordination ratio of 1:3 has been established, and effective kinetic parameters have been calculated. Air oxidation of THP in the presence of CdCl2 at room temperature produces coordination polymer 3∞[Cd3Cl6(OP(CH2OH)3)2]. The same oxidation reaction at 70 °C gives another coordination polymer, ∞[CdCl2(OP(CH2OH)3)]. These complexes are the first structurally characterized complexes featuring OP(CH2OH)3 as a ligand that acts as a linker between Cd atoms. The addition of NaBPh4 to the reaction mixture gives coordination polymer ∞[Na2CdCl2(O2P(CH2OH)2)2(H2O)3] with (HOCH2)2PO2− as the ligand.