Tin(IV) cyanoximates: synthesis, characterization, and cytotoxicity.
In recent years, numerous organotin(IV) derivatives have exhibited remarkable cytotoxicity against several types of cancer. However, the properties of the cyanoxime-containing organotin(IV) complexes are unknown. Previously, it has been shown that cyanoximes displayed an interesting spectrum of biological activity ranging from growth-regulation to antimicrobial and pesticide detoxification actions. The work presented here attempts to combine the useful properties of both groups of compounds and investigate the likely antiproliferating activity of the new substances. A series of 19 organotin(IV) complexes, with nine different cyanoxime ligands, were anaerobically prepared by means of the heterogeneous metathesis reaction between the respective organotin(IV) halides (Cl, Br) and ML (M=Ag, Tl; L=cyanoximate anion), using an ultrasound in the CH3CN at room temperature. The compounds were characterized using spectroscopic methods (UV-visible, IR, 1H,13C NMR, 119Sn Mössbauer) and X-ray analysis. The crystal structures of the complexes revealed the formation of two types of tin(IV) cyanoximates: mononuclear five-coordinated compounds of R4-xSnLx composition (R=Me, Et, n-Bu, Ph; x=1, 2; L=cyanoximate anion), and the tetranuclear R8Sn4(OH)2O2L2 species (R=n-Bu, Ph). The latter complex contains a planar [Sn4(OH)2O2]2- core, consisting of three adjacent rhombs with bridging oxo and hydroxo groups. The tin(IV) atoms are five-coordinated and have distorted trigonal-pyramidal surrounding. This is the first instance when the organic anions were found to act as monodentate O-bound planar oxime ligands. All of the compounds were studied in vitro for antiproliferating activity, using human cervical cancer HeLa and WiDR colon cancer cell lines; cisplatin was used as a positive control substance. The two dibutyltin(IV) cyanoximates showed cytotoxicity similar and greater to that of cisplatin.
Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri 65897, USA. NNGerasimchuk@missouristate.edu
Nikolay
N
Gerasimchuk
Tiffany
T
Maher
Paul
P
Durham
Konstantin V
KV
Domasevitch
Janet
J
Wilking
Andrew
A
Mokhir
D000838:Anions / Q000737:chemistry; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D018360:Crystallography, X-Ray; D003486:Cyanides / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity*; D006801:Humans; D008024:Ligands; D008672:Metals, Alkali / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D009947:Organotin Compounds / Q000737:chemistry; D010091:Oximes / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity*; D012834:Silver / Q000737:chemistry; D013057:Spectrum Analysis; D013696:Temperature; D013793:Thallium / Q000737:chemistry; D017971:Tin Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000633:toxicity*
D000838:Anions; D003486:Cyanides; D008024:Ligands; D008672:Metals, Alkali; D009947:Organotin Compounds; D010091:Oximes; D017971:Tin Compounds; D012834:Silver; D013793:Thallium