Synthesis of complexes of platinum (II) with C,N,N′-terdentate Schiff base donor ligands. Crystal and molecular structure of [Pt{3-Me-4-MeOC6H2C(H)NCH2CH2NMe2}(Me)]

Abstract Treatment of the potentially terdentate ligands C 6 R x H 5− x C(H)N–CH 2 CH 2 NMe 2 [R: a ( x =2), 2,4-(MeO) 2 ; b ( x =2), 3,4-(MeO) 2 ; c ( x =2), 3-Me-4-MeO; d ( x =3), 2,3,4-(MeO) 3 ; e ( x =2), 4,5-(OCH 2 O); f ( x =1), 2-NO 2 ] with [PtMe 2 (COD)] gave the platinated compounds [Pt{C 6 R x H 4− x C(H)NCH 2 CH 2 –NMe 2 }(Me)] with two fused five-membered rings at platinum. The crystal and molecular structure of [Pt{3-Me-4-MeOC 6 H 2 C(H)NCH 2 CH 2 NMe 2 }(Me)] has been determined by X-ray crystallography. The reactivity of these complexes was tested by the reactions of [Pt{2,4-(MeO) 2 C 6 H 2 C(H)NCH 2 CH 2 NMe 2 }–(Me)] with tertiary phosphines and diphosphines. In the latter case, dinuclear and mononuclear platinum complexes were synthesized, with bridging or chelating diphosphine ligands, respectively, depending on the complex/diphosphine molar ratio used. The reaction of the related potentially hexadentate ligand 1,4-[Me 2 NCH 2 CH 2 N(H)C] 2 C 6 H 4 with [PtMe 2 (COD)] gave the metallated compound [(Me)Pt{Me 2 NCH 2 CH 2 N(H)C}C 6 H 2 {C(H)N–CH 2 CH 2 NMe 2 }Pt(Me)] with five fused rings.