119mSn Mössbauer studies on tin compounds

Barbieri, Renato; Huber, F.; Pellerito, Lorenzo; Ruisi, Gìuseppe; Silvestri, Arturo

doi:10.1007/978-94-011-4938-9_14

Cited by 61 publications

(91 citation statements)

References 162 publications

(157 reference statements)

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“…, fully consistent with a trigonal bipyramidal structure with organic groups in the equatorial plane and electronegative ligands in axial positions [24], tin being 5-coordinate.…”

Section: Spectroscopic Datasupporting

confidence: 75%

Triorganotin(IV) derivatives of 7-amino-2-(methylthio)[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylic acid. Synthesis, spectroscopic characterization, in vitro antimicrobial activity and X-ray crystallography

Ruisi

Canfora

Brunò

et al. 2010

Journal of Organometallic Chemistry

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“…, fully consistent with a trigonal bipyramidal structure with organic groups in the equatorial plane and electronegative ligands in axial positions [24], tin being 5-coordinate.…”

Section: Spectroscopic Datasupporting

confidence: 75%

Triorganotin(IV) derivatives of 7-amino-2-(methylthio)[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylic acid. Synthesis, spectroscopic characterization, in vitro antimicrobial activity and X-ray crystallography

Ruisi

Canfora

Brunò

et al. 2010

Journal of Organometallic Chemistry

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“…Two geometries would be in this case formally possible, i.e., fac-R 3 and mer-R 3 trigonal bipyramidal; in both cases a severely distorted structure would be expected, due to the narrow bite angle in the ligand. Assuming regular structures, the fac-R 3 configuration may be excluded, as the quadrupole splitting value would be considerably lower than that observed, while it falls in the characteristic range for mer-R 3 tbp complexes (2.99-4.08 mm s À1 [19]). Actually, the distortions introduced by the O\N (or, possibly, N\N) chelation would preferentially give rise to a distorted tetrahedron with a long, additional tin-ligand bond [20] and a considerably lower quadrupole splitting value [19].…”

Section: Htpo Derivativesmentioning

confidence: 85%

“…The 119 Sn Mö ssbauer quadrupole splitting values, reported in Table 1, allow us to make the following considerations about the coordination geometry of compounds 1 and 2: (i) tetrahedral species, originated by unidentate ligand coordination, can be excluded on the basis of the DE values, considerably larger than those observed for compounds of such geometry (<3.2 mm s À1 , [19]); (ii) the coordination number of tin may increase as a result of a bidentate, chelate or bridged bis-unidentate, coordination. Chelation through N(4), O(5) would be sterically favoured with respect to the N(3), N(4) one (see Fig.…”

Section: Htpo Derivativesmentioning

confidence: 99%

Synthesis, characterization, and in vitro antimicrobial activity of organotin(IV) complexes with triazolo-pyrimidine ligands containing exocyclic oxygen atoms

Girasolo

Salvo

Schillaci

et al. 2005

Journal of Organometallic Chemistry

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Tri-organotin(IV) complexes of the triazolo-pyrimidine derivatives 4,5-dihydro-5-oxo-[1,2,4]triazolo-[1,5a]pyrimidine (5HtpO), 4,7-dihydro-5-methyl-7-oxo-[1,2,4]triazolo-[1,5a]pyrimidine (HmtpO), and 4,5,6,7-tetrahydro-5,7-dioxo-[1,2,4]triazolo-[1,5a]pyrimidine (H 2 tpO 2 ), and the diorganotin derivative n-Bu 2 Sn(tpO 2 ), were synthesized and characterized by means of infrared and 119 Sn Mö ssbauer spectroscopy. In all the complexes obtained the triazolopyrimidines act as multidentate ligands producing polymeric structures.A trigonal bipyramidal arrangement of the ligands around the tin atom is proposed for triorganotin(IV) derivatives, with organic groups on the equatorial plane and bridging anionic ligands.DFT calculations were performed on the structure of H 2 tpO 2 and on its mono-an di-anions, to investigate their harmonic vibrational modes. The observed trend of the experimental and calculated carbonyl stretching frequencies furnishes a support for the interpretation of the structure of the organotin(IV) complexes obtained with this ligand.The structure of n-Bu 2 Sn(tpO 2 ) was elucidated by quantum chemical calculations, performed on a model system of the polymeric complex by a two layers ONIOM method. The combined experimental and theoretical results obtained support for a trans-n-Bu 2 distorted octahedral geometry, with the tpO 2À 2 units acting as bis-chelate ligands bridging the diorganotin(IV) moieties, and with the N(1)O(7) and N(4)O(5) chelating groups in the equatorial plane showing a cis-O 2 , or cis-N 2 , coordination.In vitro antimicrobial tests were performed on n-Bu 3 Sn(HtpO 2 ) and Ph 3 Sn(HtpO 2 ), and a good antifungal and antibiofilm activity was observed, in particular for n-Bu 3 Sn(HtpO 2 ).

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“…40 A comparison between the quadrupole splitting data for organotin(IV) derivatives and those reported in the literature for analogous compounds, 41 leads to the conclusion that, diorganotin(IV) complexes show hexa-coordination, 42 while the triorganotin(IV) adducts show penta-coordination. 43 Biological studies Antibacterial activity. Antibacterial activity was performed against two Gram positive (Bacillus subtilis, Staphlococcus aureus) and 4 Gram-negative (Escherichia coli, Schigella flexenari, Pseudomonas aeruginosa, Salmonella typh) bacteria and the results are summarized in Table 6.…”

Section: Sn Mössbauer Spectramentioning

confidence: 99%

Comparative study of structure: activity relationship of di and triorganotin (IV) complexes of monomethyl glutarate

Rehman¹,

Baloch²,

Badshah³

2005

J. Braz. Chem. Soc.

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Uma série de complexos di-e tri-organoestanho(IV) de metilglutarato foram sintetizados e caracterizados por espectroscopia de RMN de 1 H, 13 C e 119 Sn, no infravermelho e Mössbauer de 119 Sn. Baseado nestas técnicas propõe-se que o ligante se encontra ligado ao estanho através do oxigênio da carbonila. Os dados revelam também que os complexos diorganoestanho(IV) são hexacoordenados, com geometria octaedrica, enquanto que os complexos triorganoestanho(IV) são pentacoordenados e possuem geometria bipiramidal trigonal. A avaliação biológica contra vários microorganismos indica que os complexos diorganoestanho(IV) são menos ativos que os triorganoestanho(IV).A series of di and triorganotin(IV) complexes of monomethyl glutarate have been synthesized and characterized through 1 H 13 C 119 Sn NMR, FT-IR and 119 Sn Mössbauer spectroscopy. On the basis of these techniques, it is proposed that the ligand molecule is bound to the tin atom through the carbonyl oxygen. The data reveal that diorganotin(IV) complexes exhibit hexa-coordination with octahedral geometry, while triorganotin(IV) complexes have penta-coordination with trigonal bipyramidal geometry. Biological evaluation against various microorganisms indicate that diorganotin(IV) complexes are less active than the triorganotin(IV) complexes.Keywords: organotin(IV), monomethyl glutarate, biological activity IntroductionOrganotin(IV) complexes have wide applications as catalysts, stabilizers as biocides, as antifouling agents, and for wood preservers. [1][2][3][4][5][6][7][8][9][10] In recent years, investigations have been carried out to test their antitumor activity, and it has been observed that indeed several di and triorganotin(IV) species were found to be active against various types of cancer. 11-13. Biological activity of organotin complexes is believed to be independent on the structure of molecule and coordination number of the metal. [4][5][6] It has also been noted that many di and triorganotin(IV) carboxylates display interesting anti tumor activities. [13][14][15][16][17][18][19][20] However the solubility of di and tri-organotin(IV) carboxylates in water and water-ethanol is poor, therefore many organotin(IV) complexes with carboxylate ligands containing polar subsitituents (hydroxo and oxo groups) have been prepared and studied. [13][14][15][16][17][18][19][20] In a previous paper we described the synthesis of organotin(IV) complexes of maleimidoacetic acid. 21 In the present work we report the synthesis, spectroscopic characterization, antibacterial and various biological activities of a series of di and triorganotin(IV) complexes of monomethyl glutarate. ExperimentalAll the di and triorganotin(IV) compounds except for dibenzyl and tribenzyl tin chlorides were purchased from Fluka and were used as such. Di and tribenzyltin chlorides were synthesized from the literature method. 22 All the reactions were carried out under anhydrous and oxygen free nitrogen atmosphere. The solvents used were dried before use according to the literature method. 23 The...

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119mSn Mössbauer studies on tin compounds

Cited by 61 publications

References 162 publications

Triorganotin(IV) derivatives of 7-amino-2-(methylthio)[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylic acid. Synthesis, spectroscopic characterization, in vitro antimicrobial activity and X-ray crystallography

Triorganotin(IV) derivatives of 7-amino-2-(methylthio)[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylic acid. Synthesis, spectroscopic characterization, in vitro antimicrobial activity and X-ray crystallography

Synthesis, characterization, and in vitro antimicrobial activity of organotin(IV) complexes with triazolo-pyrimidine ligands containing exocyclic oxygen atoms

Comparative study of structure: activity relationship of di and triorganotin (IV) complexes of monomethyl glutarate

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