Synthesis and characterization of Pt(II)-catecholate and amidophenolate complexes. X-ray crystal structures of Pt{O 2C 6H 2(NO 2) 2}(PMe 2Ph) 2 and Pt(NHC 6H 4O)(PPh 3) 2

Abstract

Treatment of cis-MCl 2L 2 (L = phosphine or COD) with (OH) 2C 6H 2-3,5-(NO 2) 2[3,5-dncH 2], 2-NH 2C 6H 4OH [amOH 2] or 4-NO 2C 6H 3(NH 2) 2 [npdaH 2] in the presence of base (dbu or triethylamine) gives Pt(3,5-dnc)(PR 3) 2 [PR 3 = PMePh 2 ( 1, PMe 2Ph ( 2)] and Pt(amO)(PR 3) 2 [PR 3 = PMe 3 ( 3), PMe 2Ph ( 4), PPh 3 ( 5)], and M(npda)(COD) [M = Pt ( 6), Pd ( 7)] and Pt(3,5-dnc)(COD) ( 8). The molecular structures of 2 and 5 have been determined by single-crystal X-ray diffraction. Compound 2 displays square planar coordination with the catecholate ligands forming overlapping “dimer pairs” with π-π and O⋯Pt interactions. In contrast, 5 has distorted square planar geometry together with marked differences between the PtP distances trans to the oxygen and nitrogen.