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Coordination properties of the ACE inhibitor captopril towards Me2Sn(IV)2+ in aqueous solution, and biological aspects of some dialkyltin(IV) derivatives of this ligand
- Source :
-
Journal of Organometallic Chemistry . Feb2003, Vol. 668 Issue 1/2, p129. 11p. - Publication Year :
- 2003
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Abstract
- The coordination of Me2Sn(IV)2+ (&z.dbnd6;M) to captopril {N-[(S)-3-mercapto-2-methylpropionyl]-l-proline, &z.dbnd6;H2(cap), H2L} in aqueous solution was studied by means of potentiometric titration, electrospray mass spectrometry, 1H-NMR spectroscopy and Mo¨ssbauer spectroscopy in the pH range 2–11 (I=0.1 mol dm−3 NaClO4, 298 K). The results obtained with these methods proved that only monomeric complexes are formed in solution. In the acidic pH range, species with a metal-to-ligand ratio of 1:1 exist. The neutral complex ML, similarly to the complex Me2Sn(cap) crystallized in the same pH range, adopts a tbp structure with eq &z.sbnd;S− and ax &z.sbnd;COO−, while, instead of the coordination of the amide &z.sbnd;C&z.dbnd6;O, observed in the solid state, the other ax position is occupied by a H2O molecule. With increasing pH, in the neutral and weakly basic pH range the complexes MLH−1 and ML2 are formed, in which the &z.sbnd;COO− group is displaced from the coordination sphere by an OH− and an S− of another ligand, respectively. Biological activity tests on Me2Sn(cap) and three further R2Sn(IV) captopril complexes showed that n-Bu2Sn(cap) and t-Bu2Sn(cap) exert toxic activity towards the embryos of Ciona intestinalis, while the ligand itself does not affect the development of the embryos to any significant extent; Me2Sn(cap) and Et2Sn(cap) produced normal swimming larvae. [Copyright &y& Elsevier]
- Subjects :
- *ORGANOTIN compounds
*MASS spectrometry
Subjects
Details
- Language :
- English
- ISSN :
- 0022328X
- Volume :
- 668
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Organometallic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 9144147
- Full Text :
- https://doi.org/10.1016/S0022-328X(03)00015-9