Bis(3-pyridyl)methylvinylsilane (L1) and 1,2-di(3-quinolyl) dimethyl disilane (L2): Synthesis and complexation reactions. Anion controlled solid state structures of cationic Ag(I)–L1 complex

3-Bromopyridine and 3-bromoquinoline on reaction with n-butyllithium give lithiated products which on reaction with dichloromethylvinylsilane and 1,2-dichlorodimethyldisilane at −78 °C result in the ligands bis(3-pyridyl)methylvinylsilane (L1) and 1,2-di(3-quinolyl)dimethyl disilane (L2). The complexation reactions of both these ligands with Ag(I), Pd(II) and Cu(II) have been explored. The 1H, 13C{1H} and 29Si{1H}NMR and IR spectra of both the ligands and their metal complexes have been found characteristic. The complex of L1 with silver(I), [Ag(L1)]ClO4 (1) gives suitable single crystals characterized by X-ray diffraction. Its structure consists of two dimensional sheets, having 25-membered metallamacrocycle ring, in which Ag has distorted tetrahedral geometry and is bonded to vinyl (η2) group. On reacting AgCF3SO3 with L1 and subjecting the single crystals of the resulting complex to X-ray diffraction it has been found that contrary to 1 there is no bond between vinyl group and silver, resulting in infinite molecular strands, in which coordination geometry of silver is distorted trigonal planar. CF3SO3- anion acts as a bridge between two molecular strands through F⋯H (aromatic) and Ag⋯O secondary interactions. The Ag–C distances in 1 are 2.309(5) and 2.350(12) Å. The CC bond length does not exhibit significant change on bonding with silver in 1.

Bis(3-pyridyl)methylvinylsilane (L1) and 1,2-di(3-quinolyl)dimethyl disilane (L2) and their Ag(I), Pd(II) and Cu(II) complexes have been synthesized and characterized by 1H, 13C{1H} 29Si{1H}NMR and IR spectra and X-ray diffraction. The complex [Ag(L1)]ClO4 (1) has 2-D dimensional sheet structure having 25-membered metallamacrocycle. Silver bonded to vinyl group has distorted tetrahedral geometry. In the complex of AgCF3SO3 with L1 vinyl group does not coordinate with silver, resulting in molecular strands in which geometry of silver is distorted trigonal planar. CF3SO3- acts as a bridge between molecular strands through F⋯H (aromatic) and Ag⋯O secondary interactions. The Ag–C distances in 1 are 2.309(5) and 2.350(12) Å. The CC bond length does not exhibit significant change on bonding with silver in 1.Figure optionsDownload as PowerPoint slide