Topic
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: A series of cobalt(II) complexes of general formula [CoX 2 L 2 ] (X = Cl, Br, I, NO 3, ClO 4, NCS; L 2 = Ph 2 PCH 2 Si(CH 3 ) 2 CH 2 PPh 2 ) have been synthesised and characterised by electronic and infrared spectroscopy and by magnetic moment studies.
11 citations
TL;DR: Two novel pendant-armed dialdehydes were prepared by a one-step reaction between 5-chloro-3-(chloromethyl)-2-hydroxybenzaldehyde and cyclohexylamine involving two nucleophilic substitutions, and they were used to react with 1,3-propanediamine to prepare Schiff-base macrocyclic complexes in the presence of ZnX2 salts.
Abstract: Two novel pendant-armed dialdehydes (1a and 1b) were prepared by a one-step reaction between 5-chloro-3-(chloromethyl)-2-hydroxybenzaldehyde/5-methyl-3-(chloromethyl)-2-hydroxybenzaldehyde and cyclohexylamine involving two nucleophilic substitutions, and they were used to react with 1,3-propanediamine to prepare Schiff-base macrocyclic complexes in the presence of ZnX2 salts (X = Cl, Br, and I). As a result, five dinuclear (2a, 2b, 3b, 4a, and 4b) and one mononuclear (3a) [1 + 1] flexible macrocyclic Zn(II) complexes have been structurally and spectrally characterized. The zinc centers in three pairs of macrocyclic complexes have the common four-coordinate tetrahedral geometry with one or two coordinated halide ions, where the template Zn(II) cations and the auxiliary halide anions with different sizes and coordination abilities are believed to play important roles in forming the resulting macrocyclic complexes. In addition, subtle alterations of electron-withdrawing and electron-donating substituted groups (Cl versus CH3) in the macrocyclic backbone result in different 1H NMR and UV-vis spectra.
11 citations
TL;DR: In this paper, metronidazole metal complexes were synthesized and characterized by elemental analysis, IR, electronic spectra, magnetic susceptibility and ESR spectra of Cu (II)and Co (II), to know their geometries and mode of bonding.
11 citations
TL;DR: In this article, the bond-stretching region of the IR spectrum was examined using Fourier transform spectroscopy and in an argon matrix at 14 K. Wilson FG-matrix calculations permitted identification of all stretching frequencies except forbidden ν1 vibrations of Ru16O4 and Ru18O4.
11 citations
TL;DR: Osmium tetroxide (OsO(4) is a heavy tetrahedral molecule that constitutes a benchmark for quantum chemistry calculations and its favorable spin statistics is such that only A(1) and A(2) (T(d) symmetry) rovibrational levels are allowed, leading to a dense but quite easily resolvable spectrum.
Abstract: Osmium tetroxide (OsO4) is a heavy tetrahedral molecule that constitutes a benchmark for quantum chemistry calculations. Its favorable spin statistics (due to the zero nuclear spin of oxygen atoms) is such that only A1 and A2 (Td symmetry) rovibrational levels are allowed, leading to a dense but quite easily resolvable spectrum. We reinvestigate here the ν1/ν3 stretching fundamental (940–980 cm–1) dyad region and perform new assignments and effective Hamiltonian parameter fits for the main isotopologue (192OsO4). We also investigate the ν2/ν4 bending fundamental dyad (300–360 cm–1) for the first time and perform a preliminary analysis. New experimental data have been obtained at 0.001 cm–1 resolution using an isotopically pure 192OsO4 sample and the Synchrotron SOLEIL light source. Assignments and analyses were performed using SPVIEW and XTDS software, respectively. We provide precise effective Hamiltonian parameters, including the band centers for all of the fundamental levels and rotational constants fo...
11 citations