Spectral studies of platinum(II) complexes with 2,3-disubstituteq quinazolin- (3H)-4-ones

Abstract

A number of platinum(II) complexes of 2,3-disubstituted quinazolin-(3H)-4-ones have been synthesized and characterized based on analytical, conductivity, magnetic, infrared, electronic and PMR data. The reactions between PtCl₂ and O-O donor ligands such as 2-(R)-3-(X) substituted quinazoline-(3H)-4-ones, where R = methyl/phenyl and X = hydroxyl (MHQ/ PHQ), hydroxyethyl (MHEQ/PHEQ)<em>, </em>o-hydroxyphenyl (MHPQ/PHPQ) and carboxymethyl (MCMQ/ PCMQ), yield neutral complexes of the type Pt(O-O)₂. The O-N donor ligands like 2-(R)-3-(X) substituted quinazoline-(3H)-4-ones, where R = methyl/phenyl and X = amino (MAQ/PAQ)<em>, </em>anilino (MANQ/PANQ), <em>o</em>-aminophenyl (MAPQ/PAPQ) and 2'-pyridyl (MPQ/PPQ)<em>, </em>yield ionic complexes of the type Pt(O-N)₂Cl₂. The infrared and PMR spectral data or the metal complexes indicate that MHQ, PHQ, MHEQ, PHEQ, MHPQ, PHPQ, MCMQ and PCMQ act as mononegative bidentate ligands and MAQ, PAQ, MANQ, PANQ, MAPQ, PAPQ, MPQ and PPQ act as neutral bidentate. The complexes are assigned square-planar structures.