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Gerasimchuk N, Maher T, Durham P, Domasevitch KV, Wilking J, Mokhir A. Tin(IV) cyanoximates: synthesis, characterization, and cytotoxicity. Inorg Chem 2007; 46:7268-84. [PMID: 17676728 DOI: 10.1021/ic061354f] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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.
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Affiliation(s)
- Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri 65897, USA.
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Barone G, Silvestri A, Ruisi G, La Manna G. DFT Calculations of the Electric Field Gradient at the Tin Nucleus as a Support of Structural Interpretation by119Sn Mössbauer Spectroscopy. Chemistry 2005; 11:6185-91. [PMID: 16052634 DOI: 10.1002/chem.200401156] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
DFT calculations, using an all-electron basis set and with full geometry optimization, were performed on 34 Sn(II) and Sn(IV) compounds of known structure and (119)Sn Mössbauer parameters, to obtain the theoretical values of the electric field gradient components, V(xx), V(yy), and V(zz), at the tin nucleus. These were used to determine the quantity V = V(zz)[1+ 1/3((V(xx) - V(yy))/((V(zz))(2)](1/2), for each investigated compound, which is related to the quadrupole splitting (DeltaE) parameter according to DeltaE = 1/2eQV, where e is the electronic charge and Q is the quadrupole moment of the tin nucleus. The linear fitting of the correlation plot of the experimental DeltaE, versus the corresponding calculated V values, produced a slope that is equal to 0.93 +/- 0.03 and a correlation coefficient R = 0.982. The value of Q obtained, 15.2 +/- 4.4 fm(2), is in agreement with that previously experimentally determined or calculated by analogous procedures. The calculation method is able to establish the sign of the electric field gradient component V(zz), in agreement with the sign of DeltaE determined experimentally by Mössbauer-Zeeman spectroscopy. The calculated structural parameters are in good agreement with the corresponding experimental data, determined by X-ray crystallography in the solid state, with average structural deviations of about 3 % for bond lengths and angles in the tin environment. Calculated values of DeltaE were obtained from the calibration fitting constant and from the values of V. By comparing experimental and calculated DeltaE parameters, the structure assignment of configurational isomers was successful in two test cases, in agreement with the experimental X-ray crystallographic structures. These results indicate that the method can be used as a tool to support the routine structure interpretation of tin compounds by (119)Sn Mössbauer spectroscopy.
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Affiliation(s)
- Giampaolo Barone
- Dipartimento di Chimica Inorganica e Analitica Stanislao Cannizzaro, Università di Palermo, Parco d'Orleans II, Italy.
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Tessier C, Rochon FD, Beauchamp AL. Binding of the Oxo−Rhenium(V) Core to Methionine and to N-Terminal Histidine Dipeptides. Inorg Chem 2004; 43:7463-73. [PMID: 15530097 DOI: 10.1021/ic048776e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ReOX(2)(met) compounds (X = Cl, Br) adopt a distorted octahedral structure in which a carboxylato oxygen lies trans to the Re=O bond, whereas the equatorial plane is occupied by two cis halides, an NH(2), and an SCH(3) group. Coordination of the SCH(3) unit creates an asymmetric center, leading to two diastereoisomers. X-ray diffraction studies reveal that the crystals of ReOBr(2)(d,l-met).1/2H(2)O and ReOBr(2)(d,l-met).1/2CH(3)OH contain only the syn isomer (S-CH(3) bond on the side of the Re=O bond), whereas ReOCl(2)(d-met) and ReOCl(2)(d,l-met) consist of the pure anti isomer. (1)H NMR spectroscopy shows that both isomers coexist in equilibrium in acetone (anti/syn ratio = 1:1 for X = Br, 3:1 for X = Cl). Exchange between these two isomers is fast above room temperature, but it slows down below 0 degrees C, and the sharp second-order spectra of both isomers at -20 degrees C were fully assigned. The coupling constants are consistent with the solid-state conformations being retained in solution. Complexes of the type [ReOX(2)(His-aa)]X (X = Cl, Br) are isolated with the dipeptides His-aa (aa = Gly, Ala, Leu, and Phe). X-ray diffraction work on [ReOBr(2)(His-Ala)]Br reveals the presence of distorted octahedral cations containing the Re=O(3+) core and a dipeptide coordinated through the histidine residue via the imidazole nitrogen, the terminal amino group, and the amide oxygen, the site trans to the Re=O bond being occupied by the oxygen. The alanine residue is ended by a protonated carboxylic group that does not participate in the coordination. The constant pattern of the(1)H NMR signals for the protons in the histidine residue confirms that the various dipeptides adopt a similar binding mode, consistent with the solid-state structure being retained in CD(3)OD solution.
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Affiliation(s)
- Christian Tessier
- Département de Chimie, Université de Montréal, C. P. 6128, Succ. Centre-ville, Montréal, Québec, Canada H3C 3J7
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Surdy P, Rubini P, Buzás N, Henry B, Pellerito L, Gajda T. Interaction of Dimethyltin(IV)2+ Cation with Gly-Gly, Gly-His, and Some Related Ligands. A New Case of a Metal Ion Able To Promote Peptide Nitrogen Deprotonation in Aqueous Solution. Inorg Chem 1999. [DOI: 10.1021/ic980398o] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Péter Surdy
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
| | - Patrice Rubini
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
| | - Norbert Buzás
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
| | - Bernard Henry
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
| | - Lorenzo Pellerito
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
| | - Tamás Gajda
- Department of Inorganic and Analytical Chemistry, A. József University, 6701 Szeged, P.O. Box 440, Hungary, Laboratoire de Chimie Physique Organique et Colloidale, UMR SRSMC CNRS No. 7565, Université Henri PoincaréNancy I, B.P. 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France, Research Group on Biocoordination Chemistry of the Hungarian Academy of Sciences, A. József University, 6701 Szeged, P.O. Box 440, Hungary, and Department of Inorganic Chemistry, University of Palermo, Palermo, Italy
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