Synthesis and Characterization of Cobalt(II) Complexes with Hemilabile P^N Donor Ligands

Two cobalt(II) complexes viz. CoCl2{PPh2(p-C6H4NMe2)}2 (C1) and CoCl2(PPh2Py)2 (C2) were synthesized by reacting CoCl2·6H2O and 4-(dimethylamino)phenyldiphenylphosphine and diphenyl-2-pyridylphosphine ligands, respectively. The complexes were characterized by elemental analysis, FT-IR, UV-visible and electronic spin resonance (ESR) spectroscopic technique. Both the complexes were found stable at room temperature. EPR measurements and UV-visible spectra analysis of C1 and C2 are consistent with a tetrahedral Co(II) and tetragonally distorted octahedral Co(II) ions, respectively.

Luminescent Silver(I) and Copper(I) Systems Containing Pyridyl Phosphine Bridges

Luminescent silver(I) and copper(I) complexes containing pyridylphosphine ligands have been synthesized and structurally characterized by single crystal X-ray diffraction methods. The reaction of Ag(OTf) (OTf = trifluoromethanesulfonate) with 2-pyridyldiphenylphosphine in different molar ratios gives the species [Ag2(OTf)2(μ-PPh2py)2] (1), [Ag(PPh2py)2]OTf (2), [Ag(PPh2py)3]OTf (3), and [Ag2(PPh2py)3](OTf)2 (4) with several modes of coordination of the pyridylphosphine. The oxidation of the phosphine in compound 4 gave [Ag2(OTf)(μ-PPh2py)2(OPPh2py)]OTf (5) which has been structurally characterized. It shows two bridging phosphine ligands and one chelating OPPh2py ligand. The reactions of the silver salt with bis(2-pyridyl)phenylphosphine in different molar ratios affords the complex [Ag2(OTf)2(μ-PPhpy2)2] (6), while the corresponding reactions with [Cu(NCMe)4]PF6 lead to two different compounds, namely [Cu2(NCMe)2(μ-PPhpy2)2](PF6)2 (7) and [Cu2(PPhpy2)2(μ-PPhpy2)2](PF6)2 (8). All complexes exhibit luminescence in the solid state at room temperature and at 77 K