PROTONATED LIGAND OUTER-SPHERE COMPLEX FORMED IN THE REACTION OF 6-METHYLPYRIDINE-2-CARBOXALDEHYDE PHENYLHYDRAZONE WITH Ph2SnCl2. A TRUE CASE OF HYDROGEN BONDING INVOLVING AN Sn-CI BOND

Abstract

The reaction of 6-methylpyridine-2-carboxaldehyde phenylhydrazone (L) with Ph₂SnCl₂ has resulted in the formation of a complex salt [LH⁺]₂[Ph₂SnCl₄]^2-. X-ray diffraction studies on the salt reveal the structure of the [Ph₂SnCl₄] dianion to be centrosymmetric with the tin atom in a distorted octahedral trans-C₂Cl₄ environment; Sn-Cl(1) 2.598(2), Sn-Cl(2) 2.5875(7) and Sn-C(1) 2.146(3) Å. Associated with the dianion are two [PhN(H)NC(H)C₅H₃(Me)N(H)] cations via two hydrogen bonding contacts apiece, unusually involving a true Sn-Cl bond.