Monocycloplatinated complexes [Pt(HLn)(PPh3)] were synthesized using [Pt(dmso)(2)Cl-2], N'-(arylidene) benzohydrazides (H3Ln, arylidene = 1-naphthylidene or 9-phenanthrylidene), NaOAc center dot 3H(2)O, and PPh3 in 1:1:1:2 mol ratio. The same reagents in 2:1:1:2 mol ratio provided the dicycloplatinated complexes [Pt-2(mu-L-n)(PPh3)(2)Cl]. 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 (L-n)(3-) behaves as pentadentate ligand and acts is CNO-donor to one metal centre and CN-donor to the second metal centre in [Pt-2(mu-L-n)(PPh3)(2)Cl]. The spectroscopic (IR, UV-Vis and NMR) features of both types of complexes are in agreement with their corresponding identities. (C) 2015 Elsevier B.V. All rights reserved.