title: The unexpected formation of biologically active Cu(II) Schiff mono-base complexes with 2-thiophene-carboxaldehyde and dipropylenetriamine: crystal and molecular structure of CudptaSCl2.
abstract: Two novel mononuclear Cu(II) coordination compounds of the type [Cu(dptaS)Cl(2)] and [Cu(dptaS)Br(2)] (dptaS=1,3-propanediamine, N(1)-[3-aminopropyl]-N(3)-[2-thienylmethylidene] or Schiff mono-base of dipropylenetriamine with 2-thiophene-carboxaldehyde) were prepared by the hydrolysis of the di-bases, [Cu(dptaSS)Cl(2)] and [Cu(dptaSS)Br(2)] (dptaSS=1,3-propanediamine, N(1)-[2-thienylmethylidene]-N(3)-[[2-thienylmethylidene]aminopropyl] or Schiff di-base of dipropylenetriamine with 2-thiophenecarboxaldehyde) to mono-bases with the release of one aldehyde molecule and freeing of the -NH(2) group of the coordinated dpta ligand. The X-ray determined structure of the compound [Cu(dptaS)Cl(2)] was confirmed by spectroscopic methods, magnetic and molar conductivity measurements. The Cu(II) atom is a five-coordinated CuN(3)Cl(2) chromophore with three nitrogen atoms coming up from the (dptaS) ligand and two chlorine atoms completing the square pyramidal geometry. Antiproliferative activity of both novel compounds was examined against a panel of different normal and cancer cell lines (MRC5, HeLa, MCF7, HT-29 and T47D) and showed that the Cu(II) Schiff mono-bases exhibit increased activity as compared to the starting materials. In vitro studies of plasmid DNA (pDNA) and double stranded DNA (dsDNA) interaction with the compounds under study support this difference. Some of the important factors contributing to the antiproliferative activity of the compounds under study, such as ionic character and dipole moment were also discussed in terms of the density functional theory calculated electronic structures of the ligands and their Cu(II) compounds.
authors.affiliation: Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University, Thessaloniki 541 24, Greece.
authors.forename: A Th
authors.initials: AT
authors.lastname: Chaviara
authors.forename: P J
authors.initials: PJ
authors.lastname: Cox
authors.forename: K H
authors.initials: KH
authors.lastname: Repana
authors.forename: A A
authors.initials: AA
authors.lastname: Pantazaki
authors.forename: K T
authors.initials: KT
authors.lastname: Papazisis
authors.forename: A H
authors.initials: AH
authors.lastname: Kortsaris
authors.forename: D A
authors.initials: DA
authors.lastname: Kyriakidis
authors.forename: G St
authors.initials: GS
authors.lastname: Nikolov
authors.forename: C A
authors.initials: CA
authors.lastname: Bolos
mesh_terms: D000447:Aldehydes / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D003300:Copper / Q000737:chemistry; D018360:Crystallography, X-Ray; D004247:DNA / Q000187:drug effects; D019073:HT29 Cells; D006367:HeLa Cells; D006801:Humans; D015394:Molecular Structure; D010957:Plasmids / Q000187:drug effects; D011437:Propylamines / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000447:Aldehydes; D000970:Antineoplastic Agents; D011437:Propylamines; D012545:Schiff Bases; D013876:Thiophenes; D003300:Copper; D004247:DNA