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: In this paper, the nido-diphosphine complexes with a trigonal planar or tetrahedral geometry have been synthesized and the structures of complexes 1, 3 and 5 have been established by X-ray crystallography.
Abstract: Silver complexes with the nido-diphosphine [7,8-(PPh2)2-7,8-C2B9H10]– have been synthesized. Reaction of [Ag(OClO3)(PR3)] with (PPh2)2C2B10H10 in refluxing ethanol affords the three-co-ordinate complexes [Ag{(PPh2)2C2B9H10}(PR3)](PR3= PPh31 or PPh2Me 2), whereas treatment of [Ag(OClO3){(PPh2)2C2B10H10}] with L–L under the same conditions leads to the formation of [Ag{(PPh2)2C2B9H10}(L–L)][L–L = 1,10-phenanthroline 3, bis(diphenylthiophosphoryl)methane 4 or 1,2-bis(diphenylphosphino)-1,2-dicarbadodecaborane(10)5]. The structures of complexes 1, 3 and 5 have been established by X-ray crystallography. The silver atoms show a trigonal planar (1) or tetrahedral geometry (3 and 5).
41 citations
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TL;DR: In this article, the origin of chemical anisotropy in the dissolution of single-crystal silicon in alkaline solutions is discussed in terms of the atomic configuration of silicon in the pentacoordinated transition state for (100) and (111) surfaces.
Abstract: The origin of chemical anisotropy in the dissolution of single-crystal silicon in alkaline solutions is discussed in terms of the atomic configuration of silicon in the pentacoordinated transition state for (100) and (111) surfaces. It is proposed that tetravalent silicon, which is bonded in a tetrahedral geometry, is attacked in the etch process by the hydroxide ion, forming a pentacoordinated transition state. Owing to the number of bond angles that are fixed by the atomic arrangement at the surface, the energetically favoured trigonal bipyramidal geometry for a pentacoordinated complex is only slightly distorted for the former plane but significantly distorted for the latter, resulting in a higher activation energy for the dissolution of (111) surfaces. The difference in the activation energies for the dissolution of Si(100) and (111) surfaces, arising from steric hindrance in the transition state, can be estimated from the activation energy for a pseudo-rotation of a similar system.
41 citations
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TL;DR: In this paper, two new dicyanamide modulated zinc metal complexes [Zn4(LOMe)2(µ1-dca)2 (µ 1,5-dCA)2] were synthesized using H2vanen-type compartmental ligands.
41 citations
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TL;DR: In this article, the stoichiometric addition (1:2 metal-ligand) of aqueous alcoholic solutions of the metal salts to similar solutions of 1-methyl-imidazoline-2(3 H )-thione (1-meimz2SH) generated crystalline complexes of general formula, [HgX 2 (1meimzin2SH] 2 ] (X=Cl, Br, I), in good yield.
41 citations
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TL;DR: An algebraic model of boson realization is proposed to study the vibrational spectra of a tetrahedral molecule, where ten sets of bosons creation and annihilation operators are used to construct the Hamiltonian with Td symmetry.
Abstract: An algebraic model of boson realization is proposed to study the vibrational spectra of a tetrahedral molecule, where ten sets of boson creation and annihilation operators are used to construct the Hamiltonian with Td symmetry. There are two schemes in our model. The first scheme provides an eight-parameter fit to the published experimental vibrational eigenvalues of methane with a root-mean-square deviation 11.61 cm(-1) The second scheme, where the bending oscillators are assumed to be harmonic and the interactions between the bending vibrations are neglected, provides a five-parameter fit with a root-mean-square deviation 12.42 cm(-1).
41 citations