Tin(IV) Complexes with Thiosemicarbazide and 4‐Methyl‐3‐thiosemicarbazide Derivatives

Calatayud, David G.; López‐Torres, Elena; Mendiola, A.; Procopio, Jesús R.

doi:10.1002/zaac.200700299

Cited by 4 publications

(6 citation statements)

References 30 publications

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“…19 However, the cyclic molecule L 2 H 2 OCH 3 always acts as a monoanion; in most of the complexes, it acts as an NS chelate and even as bridge through the sulfur atom. 20,21 As monodentate through the sulfur atom has only been observed in the mercury complexes. 22 Moreover, the cyclic ligands are unsymmetrical ambidentate system and can therefore, give rise to linkage isomerism when they are coordinated in some of the mentioned ways, but in the dimethyltin(IV) complex [SnMe 2 (L 2 ) 2 ], both ligands are bonded by the sulfur and amine nitrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it can also act as bridge through a sulfur atom yielding a dimer and even as chelate and bridge via a nitrogen atom provided by one terminal amine in a coordination polymer. , In the methylmercury derivative, it shows an original behavior, because it is only bonded to the metal ions through the sulfur atoms in a binuclear structure . However, the cyclic molecule L 2 H 2 OCH 3 always acts as a monoanion; in most of the complexes, it acts as an NS chelate and even as bridge through the sulfur atom. , As monodentate through the sulfur atom has only been observed in the mercury complexes . Moreover, the cyclic ligands are unsymmetrical ambidentate system and can therefore, give rise to linkage isomerism when they are coordinated in some of the mentioned ways, but in the dimethyltin(IV) complex [SnMe 2 (L 2 ) 2 ], both ligands are bonded by the sulfur and amine nitrogen atoms .…”

Section: Introductionmentioning

confidence: 99%

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Diphenyllead(IV) Chloride Complexes with Benzilthiosemicarbazones. The First Bis(Thiosemicarbazone) Derivatives

2007

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Reactions of diphenyllead(IV) chloride with benzil bis(thiosemicarbazone) (L1H6) and benzil bis(4-methyl-3-thiosemicarbazone) (L1Me2H4) afforded the first complexes containing the diphenyllead(IV) moiety with bis(thiosemicarbazone) ligands. The new complexes show diverse structural characteristics depending on the ligand and the working conditions. Complexes [PbPh2Cl(L1H5)].3H2O (1) and [PbPh2Cl(L1Me2H3)] (3) are mononuclear species in which the ligands are partially deprotonated and the lead atom has a C2N2S2Cl environment in a distorted pentagonal bipyramid coordination geometry. Complex [PbPh(L1Me2H2)](2).2H2O (4) was also obtained, which contains two lead atoms in a binuclear structure with a C2N2S3 coordination sphere for each lead atom, since both dideprotonated ligands act as N2S2 chelate and as sulfur bridge. Reaction from L1H6, in the same conditions in which complex 4 was prepared, gave a mixture of products: the lead (II) complex [Pb(L1H4)]2 (2) and [PbPh3Cl]n. Reactions with the cyclic molecules 5-methoxy-5,6-diphenyl-4,5-dihydro-2H-[1,2,4]-triazine-3-thione (L2H2OCH3) and 5-methoxy-4-methyl-5,6-diphenyl-4,5-dihydro-2H-[1,2,4]-triazine-3-thione (L2MeHOCH3) were also explored. In all the complexes, the ligands are deprotonated. The complexes [PbPh2(L2)2] (5) and [PbPh2(L2MeOCH3)2] (7) present the same characteristics. The X-ray structure of 5 shows a distorted octahedral geometry around the lead atom, with the ligand molecules acting as NS chelates, but the nitrogen bonded to the metal is different; one of the triazines shows a novel behavior, since the nitrogen atom of the new imine group formed is the one that is bonded to the lead center, being a good example of linkage isomerism. The complex [PbPh2Cl(L2)] (6), which was also isolated, could not be crystallized. All the complexes were characterized by elemental analysis, mass spectrometry, IR and 1H, 13C, and 207Pb NMR spectroscopy and some of them by X-ray diffraction studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diphenyllead(IV) Chloride Complexes with Benzilthiosemicarbazones. The First Bis(Thiosemicarbazone) Derivatives

2007

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“…Following our interest in the coordinating behavior of symmetric and dissymmetric bis(thiosemicarbazone) ligands with different metals with potential biological applications such as nickel [14], copper [15], zinc [14,16] or tin [17] or with demonstrated toxicity as cadmium [14,18,19], lead [20] and mercury [21,22], in this paper we report an extension of our previous work with the symmetric ligand benzil bis(4-methyl-3-thiosemicarbazone), LMe 2 H 4 . This ligand has shown a versatile behavior with toxic metals such as PbPh 2 2+ and cadmium(II) and, depending of the pH, it acts as neutral or doubly deprotonated ligand.…”

Section: Introductionmentioning

confidence: 89%

“…This ligand has shown a versatile behavior with toxic metals such as PbPh 2 2+ and cadmium(II) and, depending of the pH, it acts as neutral or doubly deprotonated ligand. In all the complexes behaves as a tetradentate quelate donor and in some complexes also as a bridge through a sulfur atom, leading to the formation of dimeric species [17,19,20]. In this paper, the synthesis and spectroscopic characterization of four new complexes from zinc(II) and mercury(II) nitrates, and the crystal structure of the mercury complex, [Hg(LMe 2 H 4 ) (ONO 2 ) 2 ], 2, are reported.…”

Section: Introductionmentioning

confidence: 95%

Zinc and mercury complexes of benzil bis(4-methyl-3-thiosemicarbazone)

2015

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“…Due to the possibility of electronic delocalization, which is enhanced upon deprotonation, these kinds of ligands are very versatile, and N,S chelate complexes of (L 3 ) − with metal ions such as Cu(II), Co(II), Ni(II), Zn(II), Cd(II), Pb(II), and Sn(IV) have been isolated and structurally characterized. Monodentate coordination via the sulfur atom has been found in some Hg(II) complexes . Much less is known about the coordination behavior of the heterocyclic ketone HL 2 and its open-chain precursor H 2 L 1 .…”

Section: Introductionmentioning

confidence: 99%

Rhenium Complexes with Triazine Derivatives Formed from Semicarbazones and Thiosemicarbazones

López‐Torres

Abram

2008

Inorg. Chem.

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Benzil bis(semicarbazone), H2L(1), reacts with common rhenium(V) nitrido complexes such as [ReNCl2(PPh3)2] or [ReNCl2(PR2Ph)3] (R = Me, Et) under the release of one semicarbazone unit, cyclization, and formation of stable triazine-3-onato complexes of rhenium(V). The resulting 5,6-diphenyltriazine-3-one, HL (2), acts as monodentate or chelating, monoanionic ligand depending on the reaction conditions applied. Complexes of the compositions [ReNCl(L(2)-kappaN(2),kappaO)(PR2Ph)2] (R = Me, Et) or [ReN(L(2)-kappa N(2),O)(L(2)-kappaN(2))(PPh3)2] were isolated. The N(2) nitrogen atom is the preferred binding site of the monodentate form of the ligand. This contrasts the behavior of the analogous thione HL(3), which preferably coordinates to nitridorhenium(V) centers via the sulfur atom. HL(3) is readily formed by the abstraction of methanol from 5-methoxy-5,6-diphenyl-4,5-dihydro-2H-[1,2,4]triazine-3-thione, H2L(3)OCH 3. In the presence of [ReNCl2(PPh3)2] or [ReNCl2(PR2Ph)3] complexes (R = Me, Et), this reaction yields stable complexes of the composition [ReN(L(3)-kappaN(2),kappaS)(L(3)-kappaS)(PR2Ph)2] (R = Me, Et, Ph) in good yields. Reduction of the metal atom and formation of the seven-coordinate [Re(PPh3)(L(3)-kappaN(2),kappaS)3] was observed during reactions of H2L(3)OCH3 with [ReOCl3(PPh3)2] or [ReO2I(PPh3)2], while no rhenium complexes could be isolated during similar reactions with H2L(1), although cyclization of the bis(semicarbazone) and the formation of H 2L(2)OEt were observed.

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Tin(IV) Complexes with Thiosemicarbazide and 4‐Methyl‐3‐thiosemicarbazide Derivatives

Abstract: Five new complexes were isolated from a CH 2 Cl 2 solution of SnCl 4 and the ligands benzil bis(thiosemicarbazone) L 1925 depend on the ligand. Compounds were characterized by elemental analysis, mass spectrometry, IR, 13 C and 119 Sn CP/MAS NMR spectroscopy.

Cited by 4 publications

References 30 publications

Diphenyllead(IV) Chloride Complexes with Benzilthiosemicarbazones. The First Bis(Thiosemicarbazone) Derivatives

Diphenyllead(IV) Chloride Complexes with Benzilthiosemicarbazones. The First Bis(Thiosemicarbazone) Derivatives

Zinc and mercury complexes of benzil bis(4-methyl-3-thiosemicarbazone)

Rhenium Complexes with Triazine Derivatives Formed from Semicarbazones and Thiosemicarbazones

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