Bis(alkynyl) PTA and DAPTA complexes of Pt(II) and Pd(II)

Platinum(II) and palladium(II) complexes containing two substituted alkynyl groups and two PTA or DAPTA ligands (PTA = 1,3,5-triaza-7-phosphaadamantane; DAPTA = 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane) with the general formulas cis- or trans-M(PR3)2(CCR)2 (PR3 = PTA or DAPTA) were prepared by a ligand displacement reaction starting from M(CCR)2(COD) precursors or by a metathesis reaction utilizing MCl2(PR3)2 precursors in yields ranging from 68% to 89%. The substituted alkynyl groups employed were (CCR) (R = p-tolyl, o-pyridyl, m-pyridyl, m-C6H4NH2, and CH2Ph). The new complexes were characterized by multinuclear NMR and IR spectroscopy, MS and elemental analysis. The molecular structures of the complexes, cis-Pt(PTA)2(CC-p-tol)2 (cis-1), trans-Pt(PTA)2(CC-o-py)2 (trans-3), and trans-Pd(PTA)2(CC-o-py)2 (trans-4) were confirmed by single crystal X-ray crystallography.

The synthesis and characterization of new cis- and trans-bis(alkynyl)platinum and palladium PTA and DAPTA complexes is reported.Figure optionsDownload as PowerPoint slide