Structure of phenyltellurium trichloride

Einstein, F. W. B.; Jones, Tudor S. G.

doi:10.1107/s0567740882003549

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…Such hydrogen bonding of alcohols to the core of free-base porphyrins has been encountered previously. [71][72][73] The 1 H NMR spectrum of the crystals not used for structure determination was consistent with the composition of 20, confirming that the crystal selected for diffraction was representative of the bulk.…”

Section: Resultsmentioning

confidence: 59%

Rh(III) Porphyrins as Building Blocks for Porphyrin Coordination Arrays: From Dimers to Heterometallic Undecamers

et al. 2001

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The coordination chemistry of a Rh(III) porphyrin building block was investigated with a view to the construction of heterometallic arrays of porphyrins. The Rh(III) porphyrin was found to coordinate methanol in the solid state and weakly in CDCl(3) solution. Crystallization afforded five coordinate pi stacked Rh(III) porphyrins. The distribution of products from reaction of Rh(III) porphyrin with DABCO, 4,4'-bipyridine, and 4,4'-bipyrimidine could be displaced toward dimeric species by silica gel column chromatography or recrystallization which served to remove excess ligand. Weak coordination to nitriles was observed, although it was sufficiently strong to organize a dimeric complex of 5,5'-dicyano-2,2'-bipyridine in the solid state. Complexes with 4,4'-bipyrimidine and 5,5'-dicyano-2,2'-bipyridine possess uncoordinated chelating nitrogen atoms. Larger heterometallic porphyrin arrays were assembled using a combination of Sn(IV) and Rh(III) porphyrin coordination chemistry. A Sn(IV) porphyrin acted as a core around which were coordinated two isonicotinate groups, carboxylic acid functionalized porphyrins, or porphyrin trimer dendrons. Rh(III) porphyrins were coordinated to pyridyl groups at the periphery of these entities. In this way an eleven porphyrin array, with four different porphyrin metalation states, was assembled. The diamagnetic nature of both the Rh(III) and Sn(IV) porphyrins, the slow ligand exchange kinetics on the NMR time scale, and tight ligand binding permitted the porphyrin arrays to be analyzed by two-dimensional (1)H NMR techniques.

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Section: Resultsmentioning

confidence: 59%

Rh(III) Porphyrins as Building Blocks for Porphyrin Coordination Arrays: From Dimers to Heterometallic Undecamers

et al. 2001

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“…In 2 such tertiary interactions are prevented by the bulk of the aryl substituent. The other tellurium structural types include polymeric CöHsTeCli (8 ), which shares the square pyramidal local geometry of 7, but with approximately lin ear bridging Cl atoms in an infinite array [13], In addition there are many examples of compounds internally chelated by aryl groups bearing N, O, S and even Se donor groups, of which 9 is a typical example [14], Such compounds always crystallize as discrete molecules.…”

Section: Resultsmentioning

confidence: 99%

Preparation and X-Ray Structure of 4-N,N′-Bis(trimethylsilyl)- amino-3,5-diisopropylphenylselenium Trichloride

Maaninen¹,

Boeré

Chivers³

et al. 1999

Zeitschrift Für Naturforschung B

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The reaction of SeCU or SeCF with /V,/V'-bis(trimethylsilyl)-2,6-diisopropylaniline occurs not at the nitrogen atom but by electrophilic aromatic substitution at C-4 of the phenyl ring to give [(CH3)3Si]2NC6 H2('Pr:)SeCl3, which crystallizes as the chloro-bridged dimer in the triclinic system, space group P i, a -10.2598 (17), b = 13.665(3), c = 9.7838(10) A, a = 90.056(13), ß = 102.439(11), 7 = 70.922(14)°, V = 1262.3(4) A \ Z = 1. The dimer contains an essentially planar CUSe^-Cl^SeCU unit, with trans apical (Me3SihNC6H2('Pr)2 groups, resulting in approximately square pyramidal geometry at Se. The bridging Se-Cl distances are unequal at 2.587(2) and 2.749(2) A.

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“…The nearly coplanar TeBr 4 {deviation from the mean plane is limited to 0.11 A ˚(Br12 atom) and 0.08 A ˚(Br23 atom) in molecules 1 and 2 respectively} occupies the basal plane. Formation of similar square pyramidal, TeX 4 Y units in the solid state has been observed invariably for the anions [TeX 4 Y] 2 (Y = organic ligand, X = Cl, Br or Y = X = Cl 29,38 ) and among the oligomeric or polymeric supramolecular motifs in the solid state of similar organotellurium tribromides 19 as well as organotellurium trichlorides 39 including the chloro analogue of 23 Among the solid state structures of aryltellurium trichlorides and -tribromides, square pyramidal CTeX 4 units are formed when a chloro or bromo ligand of an adjacent molecule approaches the central Te atom in a direction trans to the equatorial Cl(Br)-Te bond in preference to that of the C-Te bond resulting in two quasi linear X-Te-X alignments. Formation of such a planar covalent TeX 4 moiety among 12-Te-5 hypervalent species may be said to represent a five-centre eight-electron bonding (5c-8e) system where two atomic orbitals from the Te atom and one each from four halogen atoms constitute three doubly degenerate molecular orbitals.…”

Section: Molecular and Crystal Structuresmentioning

confidence: 99%

Controlled hydrolysis of aryltellurium trichlorides using 2-pyrrolidinones: isolation and structural characterization of monomeric aryltellurium(IV) monohydroxides

et al. 2011

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The 2-pyrrolidinone (Pyrr)-assisted hydrolysis of aryltellurium trichlorides, provided their first-step hydrolysis products as 1 : 1 molecular adducts, ArTeCl 2 OH.Pyrr (Ar = 1-C 10 H 7 , Npl, 1; 2,4,6-Me 3 C 6 H 2 , Mes, 2). The hydroxo ligand occupies an equatorial position in the y-trigonal bipyramidal geometry around Te(IV) and is involved in a strong H-bonding interaction with the amido O of the base. As NplTeBr 3 did not react with 2-pyrrolidinone under similar conditions, the bromo analogue of 1, NplTeBr 2 OH.Pyrr (3), was prepared by a metathetical reaction with NaBr. Both 1 and 2 undergo electrophilic substitution with acetone and pinacolone to afford Ar(RCOCH 2 )TeCl 2 (R = Me, t-Bu), but do not react with iodoacetic acid, suggesting that the hydroxo ligand acts as a nucleophile rather than a base. The Te-OH bond in 1 is also cleaved by CH 3 COCl to give the parent trihalide NplTeCl 3 , while reaction with BrCH 2 COBr results in NplTeBr 3 (4) as the ultimate tellurium containing product. The reaction of NplTeCl 3 with N-Methyl protected 2-pyrrolidinone (PyrrMe), under similar conditions, gave an ionic complex [(PyrrMe) 2 H] [NplTeCl 4 ] ( 5), but did not react with N-acyl protected 2-pyrrolidinone, PyrrCOCH 2 Br. However, the latter added oxidatively to elemental tellurium to give (PyrrCOCH 2 ) 2 TeBr 2 (6). In the crystal lattice of 5, discreet five-coordinate square pyramidal CTeX 4 units are present, while in the case of 4 the same units are realized via intermolecular Te … Br interactions in a one-dimensional supramolecular architecture. N-(2-pyrrolidinone)amidomethyl ligands in 6 adopt a rare, if not the first, 1,6-(C,O) mode of chelation in preference to 1,4-(C,O) mode often observed in similar Te(IV) compounds.

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Structure of phenyltellurium trichloride

Cited by 17 publications

References 6 publications

Rh(III) Porphyrins as Building Blocks for Porphyrin Coordination Arrays: From Dimers to Heterometallic Undecamers

Rh(III) Porphyrins as Building Blocks for Porphyrin Coordination Arrays: From Dimers to Heterometallic Undecamers

Preparation and X-Ray Structure of 4-N,N′-Bis(trimethylsilyl)- amino-3,5-diisopropylphenylselenium Trichloride

Controlled hydrolysis of aryltellurium trichlorides using 2-pyrrolidinones: isolation and structural characterization of monomeric aryltellurium(IV) monohydroxides

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