منابع مشابه
Superalkali character of alkali-monocyclic (pseudo)oxocarbon clusters.
A series of polynuclear superalkali cations C3X3Li3(+), C3(NCN)3Li3(+), C3X(NCN)2Li3(+), C3[C(CN)2]3Li3(+), C3(NCN)[C(CN)2]2Li3(+), C3X[C(CN)2]2Li3(+) (X = O, S, Se) and their corresponding neutral species were investigated by using the density functional theory. Except for C3Se3Li3, the ionization potentials for the studied neutral species are in the range of 2.52-3.75 eV, which are lower than...
متن کاملHalogen-containing tetrametallic aluminium alkoxides.
New halogen-containing tetrametallic aluminium alkoxides of formula [Al{(mu-OEt)2AlMeCl}3] ( 2-cis; 2-trans), and [Al{(mu-OEt)2AlBr2}3] ( 4), have been synthesized by combining Al(OEt)3 and Me2AlCl (for 2) or EtAlBr2 (for 4). They were fully characterized by (1H, 27Al) NMR, IR, mp, elemental analysis, and single-crystal X-ray diffractometry. The chloride analogue of 4, [Al{(mu-OEt)2AlCl2}3] ( 3...
متن کاملThe Molecular Character of the O-2 - Center in Alkali Halides
Like other color centers (VK, H ) the OF-center in alkali halides has a strong molecular character. It is shown that methods similar to those used in the theory of transition metal salts lead to an understanding of the electronic ground state and g-factor of the Of-center. It is necessary to invoke a weak covalent bonding with the neighbouring ions. This bonding manifests itself in the crystal ...
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Ethyl acetoacetate modi®ed aluminium sec-butoxide can be hydrolysed and gelled with alkaline, neutral or acidic media within a pH range of 3.0±8.5. Alumina precipitation occurs if pH values at any point in the sol±gel transition are outside this range. Nine dierent gelling agents have been evaluated for pH dependence of gel point. Based on stoichiometric considerations, only those systems with...
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cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Canadian Journal of Chemistry
سال: 1964
ISSN: 0008-4042,1480-3291
DOI: 10.1139/v64-138