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|Title: ||SYNTHESES AND CHARACTERIZATION OF HYBRID BIDENTATE AND MULTIDENTATE TELLURIUM LIGANDS DERIVED FROM N,N-DIMETHYLBENZYLAMINE - COORDINATION BEHAVIOR OF BIS[2-((DIMETHYLAMINO)METHYL)PHENYL] TELLURIDE WITH CHROMIUM PENTACARBONYL|
|Authors: ||KAUR, R|
|Keywords: ||x-ray structure|
|Issue Date: ||1995|
|Publisher: ||AMER CHEMICAL SOC|
|Citation: ||ORGANOMETALLICS, 14(10), 4755-4763|
|Abstract: ||A range of bi- and multidentate tellurium ligands containing both Te and N donor atoms have been synthesized and characterized by multinuclear NMR (H-1, C-13, 125Te), MS, and single-crystal X-ray diffraction studies. Bidentate ligand 2-NMe(2)CH(2)C(6)H(4)TeMe (4) was obtained from the reaction of 2-NMe(2)CH(2)C(6)H(4)TeLi (3) with MeI. The reaction, in addition to the expected telluride 4, afforded the novel 2-NMe(2)CH(2)C(6)H(4)TeI (5) and the tridentate ligand (2-NMe(2)CH(2)C(6)H(4))(2)Te (6) in poor yields. The compound is monomeric with weak intermolecular contacts between the Te and iodine atoms from adjacent molecules. Alternatively, ligand 6 has been obtained by the reaction of 2-NMe(2)CH(2)C(6)H(4)Li (2) and TeI2,, and its bonding capabilities have been evaluated. Ligand 6 displaces the THF ligand in Cr(CO)(5)THF to give the complex Cr(CO)(5)(2-NMe(2)CH(2)C(6)H(4))(2)Te (13) in which the ligand is bonded only through Te. Reaction of 6 with Cr(CH3CN)(3)(CO)(3) also gives the same complex 13. Structures of the free Ligand and its complex have been determined. Ligand 6 crystallizes in monoclinic space group P2(1)/n with a 10.2310(10) Angstrom, b = 5.6110(10) Angstrom, c = 32.010(3) Angstrom, beta 97.13 degrees(1), V = 1823.4(4) Angstrom(3), Z = 4, D-c = 1.443 mg/m(3) (Mo K alpha radiation at 293(2) K). The Te atom is pyramidal, and the Cr-Te distance of 2.6665 (9) Angstrom is the shortest known. The bidentate ligand 2-NMe(2)CH(2)C(6)H(4)TePh (7) has been similarly obtained from 2 by reaction with PhTeBr. Oxidative workup of 3 afforded the ditelluride (2-NMe(2)CH(2)C(6)H(4))(2)Te-2 (8). Reaction of 8 with diazomethane gave the telluroether ligand (2-NMe(2)CH(2)C(6)H(4)Te)(2)CH2 (9). Other multidentate ligands of the type (2-NMe(2)CH(2)C(6)H(4)Te)(2)E (10-12) (E = (CH2)(3), S, Se)were obtained by the reaction of Br(CH2)(3)Br, S, and Se with 3, respectively.|
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