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Trans-dibromodioxodimethylformamide molybdenum(VI) MoO2Br2(OCHNMe2)(2)
No full textThe molecular structure of Trans-dibromodioxodimethylformamide molybdenum(VI), MoO2Br2(OCHNMe2)2 has been determined. Crystal data: Triclinic, P-1, a = 12.3005(2), b = 15.8763(4), c = 21.1653(6) Å, ? = 71.992(1)°, ? = 88.966(2)°, ? = 89.999(1)°, V = 3930.1(2) Å, Z = 12. Trans-dibromodioxodimethylformamide molybdenum(VI) was obtained by the reaction of sodium molybdate, HBr and dimethylformamide and was characterized by IR, and 1H NMR spectroscopy and elemental analysis
Mooney, H. A. & Drake, J.E. — Ecology of Biological Invasions of North America and Hawai. Berlin, Heidelberg, New York & Tokyo, Springer-Verlag, Ecological Studies, vol. 58, 1986
No full textBourlière François. Mooney, H. A. & Drake, J.E. — Ecology of Biological Invasions of North America and Hawai. Berlin, Heidelberg, New York & Tokyo, Springer-Verlag, Ecological Studies, vol. 58, 1986. In: Revue d'Écologie (La Terre et La Vie), tome 42, n°4, 1987. pp. 440-441
Hypervalent tellurium compounds containing Te-N interactions. Mononuclear and polynuclear derivatives
No full textVarious organotellurium derivatives containing the pendant arm (2-Me2NCH2)C6H4 group have been prepared and characterized. The structure of a hydrolysis by-product, [(Ph2TeCl)(2)O](2), was also established
First structurally characterized complex of an acyclic tellurated Schiff base 4-MeOC6H4TeCH2CH2N=C(CH3)C6H4-2-OH ((LH)-H-1) having metal-tellurium bond; synthesis and crystal structure of PdCl(L-1)
No full textAcyclic tellurated Schiff base [4-MeOC6H4TeCH2CH2N=C(CH3)C6H4-2-OH ((LH)-H-1)] has been synthesized by reacting 2-(4methoxyphenyltelluro)ethylamine with o-hydroxyacetophenone. The (LH)-H-1 on reaction with Na2PdCl4 forms a complex [PdCl(L-1)] in which the tellurated Schiff base coordinates in a tridentate mode. The proton and carbon-13 NMR spectra of (LH)-H-1 and the complex are characteristic. The single crystal structure of the complex is solved. The Pd-Te, Pd-Cl, Pd-O and Pd-N bond distances are 2.504(1), 2.290(4), 2.03(1) and 2.01(1) Angstrom, respectively
Synthesis of a series of 2,3-disubstituted 4H-1,4-benzothiazines and X-ray crystal structure of ethyl 7-chloro-3-methyl-4H-1,4-benzothiazine-2-carboxylate
No full textThe reaction between 2-aminobenzenethiol and ethyl acetoacetate is studied under a variety of conditions, and a procedure for the exclusive synthesis of 1,4-benzothiazines by the neat reaction of substituted aminothiols with beta-ketoesters and beta-dicarbonyl compounds in 85-96% yield is described. With microwave heating, even when both the reactants are solid, yields are high, reaction times brief, and work-up easy. A facile reaction is also observed even in a solid-state reaction. The molecular structure of ethyl 7-chloro-3-methyl-4H-1,4-benzothiazine-2-carboxylate (4d) was determined by single-crystal X-ray diffraction
Synthesis and characterization of binuclear oxomolybdenum(V) and dioxomolybdenum(VI) O,O '-ditolyl dithiophosphate complexes. Crystal structures of Mo2O3[S2P(OC6H4Me-o)(2)](4), Mo2O3[S2P(OC6H4Me-m)(2)](4) and MoO2[S2P(OC6H4Me-p)(2)](2)
No full textA series of binuclear oxomolybdenum(V) O,O?-ditolyl dithiophosphate complexes, Mo2O3[S2P(OR)2]4 (R = o-, m-, p-C6H4Me) were synthesized by drop wise addition of aqueous solution of the ammonium salt of O,O?-ditolyl dithiophosphoric acid into an acidic solution of sodium molybdate with constant stirring to yield purple solids. Dioxomolybdenum(VI) O,O?-ditolyl dithiophosphate complexes, MoO2[S2P(OR)2]2 (R = o-, m-, p-C6H4Me and CH2C6H5) were also synthesized by reducing Mo2O3[S2P(OR)2]4 with OPPh3 in benzene to yield yellow solids. These complexes were characterized by elemental analysis and IR, 1H and 31P NMR spectroscopy and, in three cases, by X-ray crystallography. In Mo2O3[S2P(OC6H4Me-o)2]4 and Mo2O3[S2P(OC6H4Me-m)2]4, the environment around each molybdenum atom can be described as the expected distorted octahedral, consisting of one terminal and one bridging oxygen along with the four chelating sulfur atoms of the dithio ligands, with one Mo–S distance being significantly longer than the other three. In MoO2[S2P(OC6H4Me-p)2]2 the geometry around the Mo atom is again distorted octahedral with two cis terminal oxygen atoms and two anisobidentate dithiophosphate ligands
Tellurated heterocycles, 2-[(2-thienyltelluro)methyl]tetrahydrofuran (L-1) and [(2-thienyltelluro)methyl]tetrahydro-2H-pyran (L-2): synthesis and complexation reactions with Pd(II), Pt(II), Hg(II), Ru(II) and Cu(I) single crystal structures of [Ru(p-cymene)Cl-2(L-1)] and cis-[PdCl2(L-2)(2)]
No full text2-Thienyllithium (ThLi) reacts with elemental Te to give ThTeLi which on reaction with tetrahydrofurfurylchloride and 2-(bromomethyl) tetrahydro-2H-pyran at -78 degrees C results in L-1 and L-2. Their complexes [PdCl2(L-1)(2)] (1), [PtCl2(L-1)(2)](2), [HgBr2(L-1)(2)](3), [Ru(p-cym-ene)Cl-2(L-1)] (4), [CuBr(L-1)] (5), [PdCl2(L-2)(2)](6), [PtCl2(L-2)(2)](7), [HgBr2(L-2)(2)](8) and [Ru(p-cymene)Cl-2(L-2)] (9). Both the ligands and all nine complexes have characteristic H-1 and C-13 NMR spectra which reveal that in most of the complexes the two ligands L-1 and L-2 coordinate through Te only. This is corroborated by single crystal structures of 4 and 6. The 4 is a half sandwich compound, in which coligands of p-cymene are Cl and L-1 (monodentate coordinated through Te). The Ru-Te bond length is 2.6340(7) Å. In the 6 Pd has nearly square planar geometry and molecules of ligand L-2 are cis to each other, which is something rare with the monodentate telluride ligands. The Pd-Te bond lengths are 2.538(2) and 2.517(2) Å. The crystal structure of 6 also shows presence of secondary (TeCl)-Cl-. . . interactions in the crystal lattice. The Pd-Pd distance in 6 becomes 3.188(3) Å, less than 3.26 Å (sum of vander Waal's radii). The ligation of L-1 and L-2 is compared with those of related ligands
Synthesis, spectroscopic characterization and structural studies of mixed ligand complexes of Sr(II) and Ba(II) with 2-hydroxybenzophenone and salicylaldehyde, hydroxyaromatic ketones or beta-diketones crystal structure of 2-HOC6H4C(O)C6H5
No full textReactions of Sr(II) and Ba(II) chlorides with 2-hydroxybenzophenone and salicylaldehyde, hydroxyaromatic ketones or beta-diketones in 1:1:1 molar ratios have resulted in the formation of mixed ligand complexes of the type [MLL'(H2O)(2)] (M = Sr(II) or Ba(II); HL = 2-hydroxybenzophenone and HL' = salicylaldehyde, 2-hydroxyacetophenone, 2-hydroxypropiophenone, pentane2,4-dione, 1-phenylbutane-1,3-dione or 1,3-diphenylpropane-1,3-dione). These complexes have been characterized by elemental analyses, TLC, IR and H-1 NMR spectroscopy
First example of bimetallic complex of platinum(II) with a hybrid organotellurium ligand [(4-MeOC6H4Te)CH2CH2OCH2CH2CH2(2-C5H4N)] (L1) containing 20-membered metallomacrocycle ring: synthesis and crystal structure
No full text1-(4-Methoxyphenyltelluro)-2-[3-(6 methyl-2 pyridyl)propoxy]ethane (L1) and its complexes [MCl2(L1)]2 (M = Pd or Pt) have been synthesized. The single crystal X-ray diffraction of [PtCl2(L1)]2 · 2CHCl3 shows a bimetallic complex of platinum(II) containing a 20-membered metallomacrocycle ring, which remains stable in solution as shown by molecular weight and conductance measurements. The Pt–Te and Pt–N bond lengths are 2.5409(3) and 2.087(5) Å, respectively. The protons of CH2 linked to Te show a deshielding > 1 ppm on the formation of the two complexes
Synthesis, characterization and spectral studies of nitrogen base adducts of bis(O,O '-ditolyldithiophosphato)nickel(II). Crystal structures of Ni[S2P(OC6H4Me-p)(2)](2) center dot C10H8N2 and Ni[S2P(OC6H4Me-o)(2)](2) center dot C14H12N2 center dot C6H6
No full textReactions of Ni[S2P(OR)2]2(R = o-, m- and p-C6H4Me) with nitrogen donor ligands, viz. pyridine (C5H5N or py), 2,2?-bipyridyl (C10H8N2 or bipy) and 2,9-dimethyl-1,10-phenanthroline (C14H12N2 or dmphen) were carried out in benzene to yield green paramagnetic solids. These adducts were characterized by UV–visible and IR spectroscopy, magnetic measurements and, in two cases, by X-ray crystallography, to indicate how the number of donor atoms and steric factors affect the Ni–S bonding. The molecular structures of 2,2?-bipyridylbis {O,O?-di(p-tolyl)dithiophosphate}nickel(II), Ni[S2P(OC6H4Me-p)2]2 · C10H8N2 and 2,9-dimethyl-1,10-phenanthrolinebis{O,O?-di(o-tolyl)dithiophosphate}nickel(II), Ni[S2P(OC6H4Me-o)2]2 · C14H12N2 · C6H6 are described. The geometry around nickel in the bipyridyl adduct is distorted octahedral with NiS4N2 coordination, whereas in the 2,9-dimethyl-1,10-phenanthroline adduct it is trigonal bipyramidal with NiS3N2 coordination in which one dithiophosphate moiety is bidentate and the other is monodentate
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