Complexation-induced distortion of a naphthalene unit symmetrically-substituted by two (N,N,P) ligands

Binuclear complexes [M2(μ-BPNNNa)] [BF4-]2 (M = CuI, 1; M = AgI, 2) were prepared by reaction of 1,5-bis [{6-(diphenylphosphanyl)-2-pyridylmethyl}n-propylamino methyl]naphthalene (BPNNNa) with M(CH3CN)4 BF4 in CH2Cl2 and were structurally characterized by single crystal X-ray diffraction studies. In complexes 1and 2, BPNNNa acts as a chelating ligand and two dppy (2-(diphenylphosphino) pyridine) units with two metal atoms are linked together in head-to-tail mode to form an eight-membered ring, which exhibits an eclipsed conformation. A significant feature in complexes 1 and 2 is the deformation of the flat naphthalene unit, in which the two aryl moieties make an angle of 10.3° (1) and 7.2° (2), respectively. A weak Ag⋯Ag interaction is present in the complex 2.

A novel polydentate phosphanyl-pyridyl ligand BPNNNa and its Group 11 chelating binuclear complexes 1 and 2 were prepared. The latter are non-emission and exhibit folding deformation of the naphthalene spacers, which may be attributable to charge transfer interaction between metal atoms and naphthalene unit as well as the possible steric stress of the ligand.Figure optionsDownload as PowerPoint slide