Synthese und Struktur von Monoazadienkomplexen des Nickels: Cinnamylidenanilin- bis(triphenylphosphin)nickel / Synthesis and Structure of Monoazadiene Complexes of Nickel: Cinnamylideneanilinebis( triphenylphosphine)nickel

Abstract

The ethylene ligand in (C2H4)Ni[P(C6H5)3]2 is substituted at -20 °C by cinnamylideneaniline C6H5N=CH-CH=CHC6H5 to yield a polymer-like intermediate. Extraction at room temperature with n-hexane gives solutions, from which the very sparingly soluble title com pound crystallizes after several days. Since numerous coordination m odes are possible for 1-m̱onoazadienes (MAD)RN=CH-CH=CHR', an X-ray structure analysis was performed, which showed an η2 (C=C )-coordinated MAD ligand. Although the ligand conform ation is almost s-trans, the significant deviation from planarity (24°) in the solid state is in agreem ent with the rather small proton coupling 3J(H2-H3)= 4.5 Hz in solution