New heptacoordinated tin complexes of 2,6-diacetylpyridine-bis(thiosemicarbazone), H2daptsc, and of 2,6-diacetylpyridine-bis(semicarbazone), H2dapsc. Crystal and molecular structures of [MeSnCl(Hdaptsc)]Cl·MeOH and [MeSnCl(H2dapsc)]Cl2·2H2O

Sousa, Gerimário F. de; Filgueiras, Carlos A. L.; Abras, A.; Al-Juaid, Salih S.; Hitchcock, Peter B.; Nixon, John F.

doi:10.1016/0020-1693(94)03798-1

Cited by 56 publications

(28 citation statements)

References 6 publications

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“…Figure 1 shows the structure of the systems under study. Studies concerning complexes of thiosemicarbazones and semicarbazones have been published in the literature [4][5][6][7] , mostly dealing with their structural and spectroscopic aspects. In the present work cyclic voltammetry and PAL measurements of the ferrocene derivatives was undertaken and the results show that the side chain affects the process taking place on the Fe atom.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and positron annihilation studies of semicarbazones and thiosemicarbazones derived from ferrocene

Graúdo¹,

Filgueiras

Marques-Netto³

et al. 2000

J. Braz. Chem. Soc.

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Uma série de seis derivados de ferroceno contendo uma cadeia lateral de semicarbazona ou tiossemicarbazona foi investigada por voltametria cíclica e estudos utilizando medidas de tempo de vida de pósitrons. Ambos os fenômenos, tanto o processo redox como o de captura de elétrons, ocorreram no átomo de ferro. Foram propostas correlações entre os dois métodos, levando em conta os substituintes na cadeia lateral dos compostos, os potenciais redox e as probabilidades de formação de o-positrônio (o-Ps).A series of six ferrocene derivatives containing a semicarbazone or thiosemicarbazone side chain was investigated by cyclic voltammetry and positron annihilation lifetime measurements. Both the redox and the electron capture processes took place on the Fe atom. Correlations between the two methods were proposed, taking into account the substituents on the side chain of the compounds, their redox potentials and the probabilities of o-positronium (o-Ps).formation.

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Section: Introductionmentioning

confidence: 99%

Electrochemical and positron annihilation studies of semicarbazones and thiosemicarbazones derived from ferrocene

Graúdo¹,

Filgueiras

Marques-Netto³

et al. 2000

J. Braz. Chem. Soc.

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“…21,22) The Schiff base-organotin complexes have received special attention in view of their chemistry and structural aspects of hypervalent species. [23][24][25][26][27][28][29][30] Regarding this, investigations concerning chelating properties and coordinative effects of 2,6-diacetylpyridine and its influence on the conformation and geometry of heptacoordinated tin complexes derived of hydrazones, 31,32) semicarbazones, thiosemicarbazones, [33][34][35][36][37][38][39][40] acylhydrazones, 41) have been undertaken. Our interest in organotin(IV) and organosilicon compounds containing pyridine moieties let us to study the influence and nature of the ligand substituents in the formation of pentacoordinate tin and silicon derivatives.…”

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confidence: 99%

Heptacoordinate Tin(IV) Compounds Derived from Pyridine Schiff Bases: Synthesis, Characterization, in Vitro Cytotoxicity, Anti-inflammatory and Antioxidant Activity

González

Gómez

Cortés-Lozada

et al. 2009

CHEMICAL & PHARMACEUTICAL BULLETIN

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Tin(IV) complexes 2a-q derived from pyridine Schiff bases were prepared and characterized. Four complexes of this series were evaluated in vitro against different carcinogenic cell lines; besides their anti-inflammatory and antioxidant properties were also tested. Combination of mass spectrometry, multinuclear NMR and Xray diffraction techniques evidenced the formation of heptacoordinated monomeric species. The X-ray diffraction analysis of 2a, 2b, 2i, 2j and 2n led to establish the heptacoordination around the tin atom in solid state and also revealed that the ligand occupies the equatorial positions of the distorted pentagonal bipyramidal geometry and the two alkyl or aryl groups the axial positions. The in-vitro study for complexes 2a-d against six tumor cell lines showed varied antiproliferative activity, the IC 50 for all tested complexes was lower than that of the cisplatin. Compounds 2a-d also exhibited anti-inflammatory activity where complex 2c resulted to be more active (IC 50 ‫11.0؍‬ m mM) than the indomethacin IC 50 ‫72.0؍‬ m mM which was used as reference. The antioxidant activity in rat brain homogenate on inhibition of thiobarbituric acid reactive substances (TBARS) indicated that 2c (IC 50 ‫77.1؍‬ m mM) is more active than the quercetine (4.11 m mM) and a a-tocopherol (IC 50 ‫90.965؍‬ m mM).

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“…A estrutura do dímero do bis(perfluorobenzoato)tetra-n-butilestanoxano está mostrada na figura 33 87 . [81][82] .…”

Section: O Potencial Terapêutico Da Química Do Estanhounclassified

A nova química do estanho

Filgueiras¹

1998

Quím. Nova

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Outros compostos inorgânicos de estanho têm tido uso prolongado, como, por exemplo, vários pigmentos. Um desses, de grande importância, é o azul cerúleo, nome tradicional do estanato de cobalto(II), CoSnO 3 , mostrado na figura 2. Naturalmente, a fonte de cor do pigmento se deve às transições eletrônicas do íon de cobalto, que é estabilizado pelo contra-íon estanato Outra aplicação interessante do SnO 2 , é o recobrimento de vidro com películas finas do óxido. Essas películas podem ser obtidas pela pirólise de SnCl 4 ou de um cloreto organoestânico passando em contato com a superfície do vidro, em contra-corrente com ar aquecido. A espessura do filme produzido pode ser controlada e vai determinar as características finais

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New heptacoordinated tin complexes of 2,6-diacetylpyridine-bis(thiosemicarbazone), H2daptsc, and of 2,6-diacetylpyridine-bis(semicarbazone), H2dapsc. Crystal and molecular structures of [MeSnCl(Hdaptsc)]Cl·MeOH and [MeSnCl(H2dapsc)]Cl2·2H2O

Cited by 56 publications

References 6 publications

Electrochemical and positron annihilation studies of semicarbazones and thiosemicarbazones derived from ferrocene

Electrochemical and positron annihilation studies of semicarbazones and thiosemicarbazones derived from ferrocene

Heptacoordinate Tin(IV) Compounds Derived from Pyridine Schiff Bases: Synthesis, Characterization, in Vitro Cytotoxicity, Anti-inflammatory and Antioxidant Activity

A nova química do estanho

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