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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: RuO4 was prepared by oxidation of elemental ruthenium and two different modifications were obtained and investigated by X-ray single crystal diffraction as mentioned in this paper, and the distance between RuO4 and OsO4 is 1.695 A.

31 citations

Journal ArticleDOI
TL;DR: In this article, the Anderson-Tsao-Curnutte theory was used to calculate the pressure-broadened width of the R-branch of the ν3-fundamental at 300°K.
Abstract: Pressure-broadened widths of CH4 lines have been calculated, using the recent formulation for tetrahedral molecules by Varanasi in the framework of the Anderson-Tsao-Curnutte theory. The present work deals mainly with lines of the R-branch of the ν3-fundamental at 300°K, for the range 1≤J≤30 and 0≤K≤18, and for the F species. In the case of CH4-N2 and CH4-O2 collisions, octopole-quadrupole, octopole-hexadecapole, hexadecapole-quadrupole, hexadecapole-hexadecapole, dispersion and overlap interactions have been included. Broadening by noble gases was treated in terms of dispersion and overlap interactions. The value |ΩCH4|=2·25×10−34 esu cm3 obtained in the present work by comparing theoretical and experimental results for γ0CH4−N2 is not far from the magnitude deduced in studies of the far-i.r. collision-induced absorption spectra of methane. A magnitude for the hexadecapole moment of |ΦCH4|=3·0×10−42 esu cm4 was also determined. The calculated and measured linewidths are in good agreement, except in CH4-Ar collisions. In the latter case, the theoretical values are appreciably lower than the experimental ones, which suggests that induced interactions may have to be included.

31 citations

Journal ArticleDOI
TL;DR: In this article, the reaction of silver(I) halides with PPh3 in acetonitrile and then with pyridine-2-thione (pySH) chloroform (1: 1:1 molar ratio) has yielded sulfur bridged dimers of general formula, [Ag2X2(μ-S-pySH)-2(PPh3)2] (X = Cl, 1, Br, 2).

31 citations

Journal ArticleDOI
TL;DR: Two coordination polymers, namely [Co2(L1)2(btec)]∙4H2O}n (1) and [Co(L2)(btec)0.5(H2E)]n (2), have been synthesized and characterized by physicochemical and spectroscopic methods as well as single-crystal diffraction as discussed by the authors.
Abstract: Two coordination polymers, namely {[Co2(L1)2(btec)]∙4H2O}n (1) and [Co(L2)(btec)0.5(H2O)]n (2) [L1 = 1,3-bis(5,6-dimethylbenzimidazole)propane, btec = 1,2,4,5-benzenetetracarboxylate, L2 = 1,2-bis(5,6-dimethylbenzimidazole-1-ylmethyl)benzene], have been synthesized and characterized by physicochemical and spectroscopic methods as well as single-crystal diffraction. The cobalt(II) atoms display different environments with a tetrahedral geometry in 1 and trigonal–bipyramidal geometry in 2. Both complexes show 2D layer structures with a rare binodal (3,4)-connected topology structure, named 3,4L13. Their catalytic activities were tested for the degradation of congo red azo dye in a Fenton-like process.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the bismuth atom was determined to have a distorted tetrahedral geometry, thus being ligated by two manganese atoms and the two nitrogen atoms of the bpy ligands.
Abstract: Treatment of [Cp′Mn(CO)2THF] (Cp′C5H4Me) with BiCl3 at 20°C affords the “bismuthinidene” species [Cp′- (CO)2Mn]2BiCl (1b) and very small amounts of the “star-type” compound [Cp′(CO)2Mn]3Bi2 (2). Higher yields of both compounds are obtained from the reaction of BiCl3 with [Na] [Cp′(CO)2MnSi(C6H5)3-]. The molecular structure of 1b has been determined by an X-ray diffraction study, which shows that the bismuth atom, having a trigonal-planar coordination geometry, is bonded to two manganese atoms and one chlorine atom. There are weak interactions between the molecules of 1b in the solid state thus forming infinite spiral chains of “inidene” complexes. Compound 1b reacts with NaI to afford the iodine-substituted species [Cp′(CO)2Mn]2BiI (3). Displacement of the chloride substituent from 1b by anionic chelating ligands AB− is also possible; 1b reacts with tropolonate, 8-oxoquinolate, or 8-mercaptoquinolate to form the bismuth(I) chelate compounds [CP′(CO)2Mn]Bi − AB (5a–c). The molecular structure of 5b has been determined by X-ray crystallography which shows the bismuth atom in a pseudo trigonalbipyramidal geometry with the nitrogen atom lying above the plane defined by the two manganese and the oxygen atoms in an apical position. The molecular structure of 5c has also been determined, and although the numerical values are not very accurate, the coordination geometry of the bismuth atom is seen to be intermediate between pseudo trigonalbipyramidal and distorted tetrahedral. Abstraction of a chloride ligand from 1b by Me3SiOSO2CF3 affords the cationic cumulene-type complex [Cp′(CO)2MnBiMn(CO)2Cp][CF3SO3] (6a). Dichloromethane solutions of 6a are not stable at room temperature but may be treated with 2,−2′-bipyridine (bpy) to afford the stable adduct [{CP′(CO)2Mn}2Bi(bpy)][CF3SO3](7). The molecular structure of 7 has been determined by X-ray analysis, and – similarly to 5c, although the numerical values are not very accurate – the overall geometry has been determined unequivocally. The bismuth atom is shown to have a distorted tetrahedral geometry, thus being ligated by two manganese atoms and the two nitrogen atoms of the bpy ligands.

30 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202240
202143
202039
201939
201847