Tellurometalates

Ansari, Mohammad A.; McConnachie, Jonathan M.; Ibers, James A.

doi:10.1021/ar00035a002

Cited by 39 publications

(24 citation statements)

References 3 publications

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“…This concurs with the +IV oxidation state of its tellurium. The half sandwich Ru complexes of 5 and 6 in which the coordination sphere of metal is composed of two chloride ligands, η 6…”

Section: -(4-ethoxyphenlytelluromethyl)tetrahydro-2h-pyranmentioning

confidence: 99%

“…The chemistry of inorganic halogenotellurium ligands, e.g. TeX 3 has been compiled by Beck 5 and of tellurometalates [M x Te y ] 2by Ansari et al 6 .…”

Section: Introductionmentioning

confidence: 99%

“…The half sandwich compound [(p-cymene)RuCl 2 ⋅2] is also characterized structurally. In this half sandwich compound, p-cymene is in a η6 bonding mode (Ru-C(av.) 2⋅192(1) Å) and Te-C(alkyl) has been found to be longer than Te-C(aryl).N-{2-(4-methoxyphenyltelluro)-ethyl}morpholine (3) and bis{2-(N-morpholino) ethyl}-telluride (4) are potentially (Te, N) and (Te, N 2 ) type of ligands.…”

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confidence: 99%

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Organotellurium ligands — designing and complexation reactions

Singh

2002

J Chem Sci

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A variety of tellurium ligands has been designed and studied for their complexation reactions in the last decade. Of these hybrid telluroethers, halotellurium ligands and polytellurides are the most notable ones. RTeand polytelluride ions have also been used to design clusters. Ligation of ditelluroethers and several hybrid telluroethers is extensively studied in our laboratories. The ditelluroether ligand RTeCH 2 TeR (where R = 4-MeOC 6 H 4) (1), similar to dppm [1,2-bis(diphenylphosphino)methane], has been synthesized in good yield (~80%) by reacting CHCl 3 with RTe-(generated in situ by borohydride reduction of R 2 Te 2). Iodine reacts with 1 to give tetra-iodo derivative, which has intermolecular TeLI interactions resulting in a macro structure containing rectangular Te-ILTe bridges. 1 readily forms four membered rings with Pd(II) and Ru(II). On the formation of this chelate ring, the signal in 125 Te NMR spectra shifts significantly upfield (50-60 ppm). The bridging mode of 1 has been shown in [Ru(p-cymene)Cl 2 ](µ-1)[Ru(p-cymene)Cl 2 ]. The hybrid telluroether ligands explored are of the types (Te x , S y), (Te x , N y) and (Te x , O y). The tellurium donor site has strong trans influence, which is manifested more strongly in square planar complexes of palladium(II). The morpholine N-donor site has been found to have weaker donor characteristics in (Te x , N y) ligands than pyridine and alkylamine donor sites of analogous ligands. The singlet oxygen readily oxidises the coordinated Te. This oxidation follows first order kinetics. The complexation reaction of RuCl 3 .xH 2 O with N-[2-(4-methoxyphenyltelluro)ethyl]phthalimide (2) results in a novel (Te, N, O)-heterocycle, Te-chloro,Te-anisyl-1a-aza-4-oxa-3-tellura-1H, 2H, 4aH-9 fluorenone. The (Te, O) ligands can be used as hemilabile ligands, the oxygen atom temporarily protects the vacant coordination site before the arrival of the substrate. The chelate shifts observed in 125 Te NMR spectra of metal complexes of Te-ligands have a close parallel to those of 31 P NMR. For the formation of fivemembered rings, the value is positive and of the order of 130 ppm whereas for sixmembered rings it is negative and ~30 ppm only.

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“…This concurs with the +IV oxidation state of its tellurium. The half sandwich Ru complexes of 5 and 6 in which the coordination sphere of metal is composed of two chloride ligands, η 6…”

Section: -(4-ethoxyphenlytelluromethyl)tetrahydro-2h-pyranmentioning

confidence: 99%

“…The chemistry of inorganic halogenotellurium ligands, e.g. TeX 3 has been compiled by Beck 5 and of tellurometalates [M x Te y ] 2by Ansari et al 6 .…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Organotellurium ligands — designing and complexation reactions

Singh

2002

J Chem Sci

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“…90 The burgeoning field of metal chalcogenide cluster chemistry has been extensively reviewed. 91, 92 Although there are vestigial similarities between the polyselenometalates and polytellurometalates on the one hand and the well known polyoxo-and polythio-metalates on the other, it is now clear that the combined effects of decreasing electronegativity and increasing size and covalency down the group ensure substantial dissimilarities in the structures encountered with the heavier congeners. A vast novel and exciting area of structural chemistry is emerging.…”

Section: The Elements In Group 16mentioning

confidence: 99%

Main group element chemistry at the millennium

Greenwood

2001

J. Chem. Soc., Dalton Trans.

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“…Recently, much attention has been focused on the soluble binary chalcogenides and polychalcogenides which exhibit a great deal of structural diversity due mainly to the variety of catenation and bonding modes of the chalcogen atoms. [1][2][3][4][5] In contrast to the large number of binary chalcogenides, comparatively few ternary chalcogenides were reported. Investigation of the ternary M-As-E (M = transition metals and main-group elements; E = S, Se) systems by using the solventothermal technique has produced several compounds.…”

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confidence: 99%