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Organosilicon backbone containing pyridyl/quinolyl ligands: Synthesis, complexation reactions and single crystal structures of metallamacrocyclic Pd(II) and Cu(II) complexes
Authors:Neetu Rani  Parbati Sengupta  Ajai K Singh  RJ Butcher
Institution:

aDepartment of Chemistry, Indian Institute of Technology, Delhi 110 016, India

bDepartment of Chemistry, Howard University, Washington, DC 20059, USA

Abstract:Organosilicon backbone containing ligands 1,2-bis(dimethyl(2-pyridyl)silyl)ethane (L1) and 1,2-bis(dimethyl(3-quinolyl)silyl) ethane (L2) have been synthesized by treating 2-bromopyridine and 3-bromoquinoline with n-butyllithium and reacting the resulting lithiated products with 1,2-bis(chlorodimethylsilyl)ethane. The ligation of L1 and L2 with Pd(II), Ag(I) and Cu(II) has been investigated. The single crystal structures of L2, Pd(L1)Cl2] (1), Cu(L1)Br2] (3) and PdCl2(L2)]2 (4) have been solved. All the three complexes are metallamacrocyclic in nature. The last one is 22-membered and the first example which has ligands containing organosilicon backbone. The geometry of Pd as well as Cu is very close to square planar. The Pd–N, Pd–Cl, Cu–N and Cu–Br bond distances (2.010(1)–2.027(3), 2.3063(10)–2.3114(4), 2.004(4)–2.018(5) and 2.4137(10)–2.4172(10) Å) are very close to sum of covalent radii, indicating strong ligation of L1 and L2 with the metal ions.
Keywords:1  2-Bis(dimethyl(2-pyridyl)silyl)ethane  1  2-Bis(dimethyl(3-quinolyl)silyl)ethane  Pyridyl ligands  Quinolyl ligands  Organosilicon ligands  Palladium  Copper  Silver  Complex  Metallamacrocycle  Crystal structure
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