Monocycloplatinated complexes [Pt(HLn)(PPh3)] were synthesized using [Pt(dmso)2Cl2], Nʹ-(arylidene)benzohydrazides (H3Ln, arylidene = 1-naphthylidene or 9-phenanthrylidene), NaOAc·3H2O, and PPh3 in 1:1:1:2 mol ratio. The same reagents in 2:1:1:2 mol ratio provided the dicycloplatinated complexes [Pt2(μ-Ln)(PPh3)2Cl]. All the complexes have been characterized by elemental analysis, X-ray crystallographic and spectroscopic measurements. X-ray structures reveal that (HLn)2− acts as pincer-like CNO-donor in [Pt(HLn)(PPh3)], while the dinucleating (Ln)3− behaves as pentadentate ligand and acts is CNO-donor to one metal centre and CN-donor to the second metal centre in [Pt2(μ-Ln)(PPh3)2Cl]. The spectroscopic (IR, UV–Vis and NMR) features of both types of complexes are in agreement with their corresponding identities.