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Tetrahedral molecular geometry
About: Tetrahedral molecular geometry is a research topic. Over the lifetime, 1795 publications have been published within this topic receiving 30706 citations.
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TL;DR: The title compound C4H8N8S2HgBr2 was prepared and characterized by means of X-ray crystallography, and i.r. measurements as discussed by the authors, which exhibits discrete monometallic units with the 1,2,4-triazole molecule acting as a monodentate ligand.
Abstract: The title compound C4H8N8S2HgBr2 was prepared and characterized by means of X-ray crystallography, and i.r. measurements. The crystals are orthorhombic, space group Pbcn (no. 60) witha=9.707(2),b=8.609(1),c=16.128(2) A, andZ=4. The compound exhibits discrete monometallic units with the 1,2,4-triazole molecule acting as a monodentate ligand. The structure consists of units in which the mercury atom is coordinated in a distorted tetrahedral geometry by two sulfur and two bromine atoms. The NH and NH2 group of the 3-amino-5-mercapto-1,2,4-triazole unit are involved in intermolecular hydrogen bonds. Infrared bands are diagnostic of the coordination environment around the metal atoms.
10 citations
TL;DR: In this article, a general expression for the integrated intensity of rotational transitions in the vibronic ground state of tetrahedral molecules, taking into account the nuclear spin statistics, is derived.
Abstract: A general expression is derived for the integrated intensity of rotational transitions in the vibronic ground state of tetrahedral molecules, taking into account the nuclear spin statistics. It is ...
10 citations
TL;DR: In this article, three new organotin(IV) carboxylates were obtained by reactions of (R)2SnO [R = otolyl] with 2-(4-methyl benzoyl) benzoic acid, and reaction of Cy3SnOH [Cy = cyclohexyl] with 4-methyl benoyl), respectively.
Abstract: Three new organotin(IV) carboxylates of composition [(R)2Sn(O2CC6H4C-OC6H4CH3)2] 1, [(R)2Sn(O2CC6H4COC6H4-C2H5)2]22, and R3SnO2 CC6H4COC6H4CH33, were obtained by reactions of (R)2SnO [R = o-tolyl] with 2-(4-methyl benzoyl) benzoic acid and 2-(4-ethyl benzoyl) benzoic acid, and reaction of Cy3SnOH [Cy = cyclohexyl] with 2-(4-methyl benzoyl) benzoic acid, respectively. The complexes 1, 2 and 3 have been characterized by elemental analysis, infrared (IR), 1HNMR, and X-ray crystallography diffraction analyses. The complex 1 has two folded symmetrical structure; the tin atom in 1 is found to adopt a distorted toward skew-trapezoidal bipyramidal geometry. Molecular structure of the complex 2 is centrosymmetric, and the internal tin atom is five-coordinated and is in distorted trigonal bipyramidal geometry. The crystal structure of the complex 3 is found to exhibit distorted tetrahedral geometry. Pilot studies have indicated that the complexes 1 and 2 have shown good antitumor activities. © 2010 Wiley Periodicals, Inc. Heteroatom Chem 21:304–313, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20614
10 citations
TL;DR: In this article, the tetrahedral geometry of the macrocyclic Schiff-base cobalt complexes was proposed and the metal to ligand ratio of the complexes was found to be 1:1.
Abstract: Four macrocyclic Schiff-base cobalt complexes, [CoL1][NO3]2 · 3H2O, [CoL2][NO3]2 · 4H2O, [CoL3][NO3]2 · 4H2O and [CoL4][NO3]2 · 2H2O, were synthesized by reaction of salicylaldehyde derivatives with 1,4-bis(3-aminopropoxy)butane or (±)-trans-1,2-diaminocyclohexane and Co(NO3)2 · 6H2O by template effect in methanol. The metals to ligand ratio of the complexes were found to be 1:1. The Co(II) complexes are proposed to be tetrahedral geometry. The macrocyclic Co(II) complexes are 1:2 electrolytes as shown by their molar conductivities (ΛM) in DMF (dimethyl formamide) at 10−3 M. The structure of Co(II) complexes is proposed from elemental analysis, Ft-IR, UV–visible spectra, magnetic susceptibility, molar conductivity measurements and mass spectra. Electrochemical and thin-layer spectroelectrochemical studies of the complexes were comparatively studied in the same experimental conditions. The electrochemical results revealed that all complexes displayed irreversible one reduction processes and their cathodic peak potential values (E
pc) were observed in around of −1.14 to 0.95 V. It was also seen that [CoL1][NO3]2 · 3H2O and [CoL2][NO3]2 · 4H2O exhibited one cathodic wave without corresponding anodic wave but, [CoL3][NO3]2 · 4H2O and [CoL4][NO3]2 · 2H2O showed one cathodic wave with corresponding anodic wave, probably due to the presence of different ligand nature even if the complexes have the same N2O2 donor set. In view of spectroelectrochemical studies [CoL3][NO3]2 · 4H2O showed distinctive spectral changes in which the intensity of the band (λ = at 316 nm, assigned to n → π* transitions) decreased and a new broad band in a low intensity about 391 nm appeared as a result of the reduction process based on the cobalt center in the complex.
10 citations
TL;DR: In this paper, a synergic approach combining X-ray absorption near-edge structure (XANES) and extended Xray absorption fine structure (EXAFS) spectroscopies together with quantum mechanical calculations on cluster models has been used to investigate the solvation properties of the HgCl2 salt and of HgO dissolved in deep eutectic solvents (DESs).
10 citations