The title compound TeIILI [L = diethyl dithiocarbamate, (C2H5)2NCS-2] was synthesized by the reduction of TeIVL2I2 with elemental tellurium. Its structure has been determined and is found to be polymeric, with I being the bridging ligand. The polymeric chain adopts a helical configuration which runs parallel to the c-axis of the tetragonal unit cell. Each tellurium is bonded to two sulphurs of a chelating dithiocarbamate group and to two iodines in a planar configuration. The bond distances of TeS(1), TeS(2), TeI and TeI′ are 2.536(4), 2.483(5), 3.108(1) and 3.279(1) Å, respectively, and the bond angles of ITeS(1), S(1)TeS(2), S(2)TeI′ and I′TeI are 149.6(2), 70.7(2), 151.1(2) and 129.2(2)°, respectively. © 1993.

Gopalaswamiengar Aravamudan

M. Ramakrishna Udupa

Maha Seshasayee

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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IIT Madras

Synthesis and crystal structure determination of the novel compound iododiethyldithiocarbamatotellurium(II)

Polyhedron

Acta Crystallographica Section C: Crystal Structure Communications

Tetraethylammonium (N,N-diethyldithio-carbamato-S,S′)tetraiodotellurate(IV)

The title compound, [SeI(C7H14NS2)]n, was prepared by the oxidative displacement of one of the dithiocarbamates in bis(di-n-propyldithiocarbamato)-selenium(II) using iodine. This complex has a polymeric structure, with the central Se atoms bridged by the iodine ions. The geometry around each Se atom is planar trapezoidal (SeS2I2), with Se - I distances of 3.124(2) and 3.232 (I) Å. This is the first example of a mixed iodide-dithiocarbamate complex of selenium(II).

The first mixed iodide-dithiocarbamate complex of selenium(II): Catena-poly[[(di-n-propyldithiocarbamato-S,S′)selenium(II)]-μ-iodo]

Bromo- and chloro-substituted tellurium(II) dithiocarbamate complexes were prepared by the reaction of iododiethyldithiocarbamatotellurium(II), dissolved in dichloromethane, with a suspension of their respective silver halide. The structure determination reveals the orthorhombic crystals of the complexes to be isomorphous, having halide-bridged polymeric structures. The polymeric chain adopts a helical configuration with the period of the helix being the length of the a-axis. Each tellurium has a TeS2X2 coordination. The Te - Br and Te - Cl distances observed in the complexes are 2.867(3) and 2.686(2) Å, respectively and this structure is similar to that of Te{(C2H5)2NCS2}1. Copyright © 1996 Elsevier Science Ltd.

Synthesis and structure of the isomorphous bromo- and chlorodiethyldithiocarbamatotellurium(II), Te{(C2H5)2NCS2}X (X = Br, Cl)

The title compound, SeLBr [L- = diethyldithiocarbamate, (C2H5)2NCS- 2] is the first example of Se(II) complex featuring a dithiocarbamate and a halide. It was obtained by the reaction of Se(IV)bromide with tetraethylthiuram disulfide in a methanol solution containing hydrobromic acid. The structure determination of the compound shows it to be polymeric with bromine being the bridging ligand. The crystals of SeLBr are monoclinic with a = 10.391(3), b = 8.434(4), c = 12.030(2) Å, β = 108.10(2)°, V = 1002.15 Å3, Z = 4 and space group, P21/n; R = 0.073, Rw = 0.074.

Phosphorus, Sulfur and Silicon and Related Elements

Synthesis and structure of the first mixed halide-dithiocarbamate complex of Se(II), bromodiethyldithiocarbamatoselenium(II), [Se{(C2H5)2NCS2}Br]

The title compound TeIVLI3 [L = diethyldithiocarbamate, (C2H5)2NCS-2], is the first example of a mixed halide-dithiocarbamate complex of TeIV with halide to a dithiocarbamate ratio of 3 : 1. Two different methods have been employed for the preparation of this compound. The first method involves the ligand exchange reaction between TeL2 and Tel4. The second method is the oxidative addition of iodine on TeIILI. The structure of the title compound has been determined and it is found to be polymeric with iodine being the bridging ligand. The polymer is made up of interlinking of edge-sharing pentagonal bipyramidal dimers, which are stacked along a axis of the triclinic unit cell. The three Te-I distances are Te-I(1) 2.982(1), Te-I(2) 2.901(1) and Te-I(3) 2.872(1) Å, and together with two Te-S and two intermolecular Te-I interactions complete the seven coordination with a distorted pentagonal bipyramidal geometry around each tellurium.

A novel mixed ligand Te(IV) complex comprising three halides and a dithiocarbamate; synthesis and crystal structure of triiododiethyldithiocarbamatotellurium(IV), Te{(C2H5)2NCS2}I3

Mixed halo dithiocarbamate complexes of TeII were synthesized for the first time. Complexes of the general formula Te2L3X (X = SCN-, Br- and I-) were obtained from the parent compound TeL2 [L = bis(2-hydroxyethyl)dithiocarbamate] and potassium thiocyanate or halides in acetic acid medium. Their chemical and physical properties were studied and the crystal structure of the thiocyanate compound determined. The crystals of the thiocyanate complex are monoclinic, with space group P 21 /n, a 14•056(3), b 9•599(2), c 22•519(6) Å, β 105•71(2)°, V 2924•8 Å3, Z 4, F(000) 1672, the final R and Rw values being 0•042 and 0•041 respectively for 1209 unique reflections. Many novel aspects were observed in the structure. The two tellurium atoms display entirely different coordinations. One of them, namely, Te(1), has two unequal bidentate dithiocarbamate groups chelated to it in planar-trapezoidal coordination similar to the geometry found in the parent TeL2 complex. It is also linked to Te(2) by a short contact [3•221(3) Å] to complete the fifth coordination. The second tellurium atom Te(2) exhibits trapezoidal four-coordination with an equal bidentate dithiocarbamate group, an S-bonded thiocyanate group, and interestingly with Te(1). The Te(1)-Te(2) axis is inclined with respect to the Te(1)-S(1)-S(2)-S(3)-S(4) plane (trapezoid) by 67•6°. © 1985 ASEG.

Australian Journal of Chemistry

Synthesis and Properties of Tris[bis(2-hydroxyethyl)dithiocarbamato]haloditellurium(II) (‘halo’ = SCN-, Br-, I-) and the Crystal Structure of the Thiocyanato-S Complex, [Te2 ((HOCH2CH2)2NCS2)3SCN]

Journal	Polyhedron
ISSN	02775387
Open Access	No