title: Anionic carbonato and oxalato cobalt(III) nitrogen mustard complexes.
abstract: Synthetic approaches to cobalt(III) complexes [Co(L)(L')2] containing the bidentate dialkylating nitrogen mustard N,N-bis(2-chloroethyl)-1,2-ethanediamine (L = dce) together with anionic ancilliary ligands (L') which are either carbonato (CO3(2-)), oxalato (ox2-), bis(2-hydroxyethyl)dithiocarbamato (bhedtc-), 2-pyridine carboxylato (pico-) or 2-pyrazine carboxylato (pyzc-) were investigated. Synthetic routes were developed using the related amines N,N-diethyl-1,2-ethanediamine (dee) and 1,2-ethanediamine (en). The complexes [Co(CO3)2(L)]- (L = dee 1, dce 2), [Co(ox)2(L)]- (L = dee 3, dce 4), [Co(bhedtc)2(dee)]+ 5, [Co(bhedtc)2(en)]+ 6, mer-[Co(pico)3], mer-[Co(pyzc)]3 7 and [Co(pico)2(dee)]+ 8 were prepared and were characterised by IR, UV-Vis, 1H and 13C[1H] NMR spectroscopy, mass spectrometry and cyclic voltammetry. [Co(bhedtc)2(en)]BPh4 6b and trans(O)-[Co(pico)2(dee)]ClO4 8 were characterised by X-ray crystallography. In vitro biological tests were carried out on complexes 1-4 in order to assess the degree to which coordination of the mustard to cobalt attenuated its cytotoxicity, and the differential toxicity in air vs. nitrogen.
authors.affiliation: Department of Chemistry, Faculty of Science, The University of Auckland, New Zealand.
authors.forename: Peter R
authors.initials: PR
authors.lastname: Craig
authors.forename: Penelope J
authors.initials: PJ
authors.lastname: Brothers
authors.forename: George R
authors.initials: GR
authors.lastname: Clark
authors.forename: William R
authors.initials: WR
authors.lastname: Wilson
authors.forename: William A
authors.initials: WA
authors.lastname: Denny
authors.forename: David C
authors.initials: DC
authors.lastname: Ware
mesh_terms: D000818:Animals; D000838:Anions / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D003035:Cobalt / Q000737:chemistry*; D006224:Cricetinae; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D004563:Electrochemistry; D005260:Female; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009588:Nitrogen Mustard Compounds / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D010070:Oxalates / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013997:Time Factors
chemical_list: D000838:Anions; D002254:Carbonates; D008024:Ligands; D009588:Nitrogen Mustard Compounds; D009942:Organometallic Compounds; D010070:Oxalates; D003035:Cobalt