Synthesis, characterization, and coordination chemistry of several novel electroneutral phosphane ligands

Abstract

The reaction of fluorocarbon (Rf) reagents C2F 5Li or C2F3Li with diaminochlorophosphanes (R2N)2PCl produced four new phosphane ligands of the type (R2N)2P(Rf). Addition of (Et2N) 2PCl to ethereal solutions of C2F5Li or C 2F3Li produced (Et2N)2PC 2F5 1 and (Et2N)2PC 2F3 2; treatment of (C4H4N) 2PCl and (C4H8N)2PCl with C 2F5Li afforded (C4H4N) 2PC2F5 3 and (C4H8N) 2PC2F5 4. All ligands were isolated as colorless, high-boiling liquids. Substitution reactions of 1-4 with Mo(CO) 6 in a refluxing alkane solvent yielded complexes of the type (L)Mo(CO)5 (L = (Et2N)2PC2F 5, 5; (Et2N)2PC2F3 6; (C4H4N)2PC2F5 7 and (C4H8N)2PC2F5 8) as colorless solids in low to moderate (25-62%) yields. Complexes 5, 7 and 8 were structurally characterized by single crystal X-ray diffraction. A comparison of IR stretching frequencies and X-ray bond length data suggests these ligands approximate the electronic influence of phosphites. © 2010 Elsevier B.V. All rights reserved.