title: Diorganotin(IV) complexes of dipeptides containing the alpha-aminoisobutyryl residue (Aib): preparation, structural characterization, antibacterial and antiproliferative activities of [(n-Bu)2 Sn(H(-1)L)] (LH=H-Aib-L-Leu-OH, H-Aib-L-Ala-OH).
abstract: Two new organotin(IV) complexes with dianionic dipeptides containing the alpha-aminoisobutyryl residue (Aib) as ligands are described. The solid complexes [(n-Bu)(2)Sn(H(-1)L(A))] x 2MeOH (1 x 2MeOH) (L(A)H=H-Aib-L-Leu-OH) and [(n-Bu)(2)Sn(H(-1)L(B))] x MeOH (2 x MeOH) (L(B)H=H-Aib-L-Ala-OH) have been isolated and characterized by single-crystal X-ray crystallography and spectroscopic techniques (H(-1)L(2-) is the dianionic form of the corresponding dipeptide). Complexes 1 x 2MeOH and 2 x MeOH are monomeric with similar molecular structures. The doubly deprotonated dipeptide behaves as a N(amino), N(peptide), O(carboxylate) ligand and binds to the Sn(IV) atom. The five-coordinate metal ion has a distorted trigonal bipyramidal geometry. A different network of intermolecular hydrogen bonds in each compound results in very dissimilar supramolecular features. The IR, far-IR, Raman and (119)Sn NMR data are discussed in terms of the nature of bonding and known structures. The antibacterial and antiproliferative activities as well as the effect of the new compounds on pDNA were examined. Complexes 1 and 2 are active against the gram-positive bacteria Bacillus subtilis and Bacillus cereus. The IC(50) values reveal that the two compounds express promising cytotoxic activity in vitro against a series of cell lines.
authors.affiliation: Department of Chemistry, University of Patras, 265 04 Patras, Greece.
authors.forename: Eugenia
authors.initials: E
authors.lastname: Katsoulakou
authors.forename: Manolis
authors.initials: M
authors.lastname: Tiliakos
authors.forename: Giannis
authors.initials: G
authors.lastname: Papaefstathiou
authors.forename: Aris
authors.initials: A
authors.lastname: Terzis
authors.forename: Catherine
authors.initials: C
authors.lastname: Raptopoulou
authors.forename: George
authors.initials: G
authors.lastname: Geromichalos
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Papazisis
authors.forename: Rigini
authors.initials: R
authors.lastname: Papi
authors.forename: Anastasia
authors.initials: A
authors.lastname: Pantazaki
authors.forename: Dimitris
authors.initials: D
authors.lastname: Kyriakidis
authors.forename: Paul
authors.initials: P
authors.lastname: Cordopatis
authors.forename: Evy
authors.initials: E
authors.lastname: Manessi-Zoupa
mesh_terms: D000621:Aminoisobutyric Acids / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis*; D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D001407:Bacillus / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D018360:Crystallography, X-Ray; D004151:Dipeptides / Q000737:chemistry*; D006801:Humans; D015394:Molecular Structure; D009947:Organotin Compounds / Q000737:chemistry* / Q000494:pharmacology*; D013057:Spectrum Analysis
chemical_list: D000621:Aminoisobutyric Acids; D000900:Anti-Bacterial Agents; D000970:Antineoplastic Agents; D004151:Dipeptides; D009947:Organotin Compounds