Kim, KM Lee, YA Lee, SS Sohn, YS 2024-01-21T15:06:20Z 2024-01-21T15:06:20Z 2022-01-10 1999-09 0020-1693 https://pubs.kist.re.kr/handle/201004/141946 (Diamine)tetracarboxylatoplatinum(IV) complexes, A(2)Pt(OOCR)(4) (A(2) = trans-(+/-)-1,2-diaminocyclohexane (dach), 2,2-dimethyl-1,3-propanediamine (dmpda), ethylenediamine (en), 2 NH3, 2 cyclopropylamine (cpa); R = CH3, C2H5), have been facilely synthesized by reacting (diamine)tetrahydroxoplatinum(Iv) with carboxylic anhydrides in dichloromethane, and their structural properties were examined by X-ray analysis and H-1 NMR spectroscopy. The reactant (dach)Pt(OH)(4) crystallizes in the triclinic space group P (1) over bar (No. 2) with two molecules in an asymmetric unit and the local geometry around the platinum(IV) atom is a regular octahedron, but the carboxylated product (dach)Pt(O2CCH3)(4) crystallizes in monoclinic space group P2(1)/c (No. 14) and the platinum(IV) atom is in a distorted octahedral environment. The most interesting structural aspect of the title complexes is that the equatorial Pt(IV)-carboxylate bonds are slightly longer than the axial ones, probably due to the difference in trans influence of the nitrogen and oxygen donating atoms. The H-1 NMR spectra also show that the axial and equatorial acetate groups are not equivalent. (C) 1999 Elsevier Science S.A. All rights reserved. English ELSEVIER SCIENCE SA Facile synthesis and structural properties of (diamine)tetracarboxylatoplatinum(IV) complexes Article 10.1016/S0020-1693(99)00169-3 1 INORGANICA CHIMICA ACTA, v.292, no.1, pp.52 - 56 INORGANICA CHIMICA ACTA 292 1 52 56 N scie scopus 000082226700007 Chemistry, Inorganic & Nuclear Chemistry Article PLATINUM(IV) COMPLEXES ANTITUMOR CARBOXYLATION REDUCTION crystal structures platinum complexes diamine complexes carboxylato complexes