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AbstractAbstract
[en] Coupled cluster, nth-order Moller-Plesset perturbation and quadratic configuration interaction theories are used to calculate the electric field gradients and nuclear quadruple coupling constants of 12 nitrogen-containing molecules using laser sets of valence DZ + P and TZ + P. These molecules are: HCN, HNC, CH3NC, CF3NC, NCNC, HCCNC, FCH2NC, F2CHNC, CH3CH2NC, H2CCH, NC, and NCCCH2NC. 52 refs., 4 figs., 5 tabs
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[en] A new method is proposed for determining the ages of molecular clouds. The method utilizes the properties of the long-chain organic molecules known as the cyanopolyynes (HC+ 1N, k = 0, l, 2, 3...), which are found in a variety of clouds. The observed regular abundance decline of these molecules as a function of chain length suggests that they are formed sequentially. If so, the age of the cloud can be read off as the time to grow the longest chain present. Although the creation process for the chains is still unknown, the age can be obtained from knowledge of the chain destruction mechanism. Destruction is probably due to adsorption onto the surfaces of interstellar grains. Using the known properties of grains, the age can be obtained from the cloud density and the abundance ratios of the cyanopolyynes. As a first application, I obtain minimum ages for the four dark clouds B335, TMC-1, TMC-2, and Ll83. These minimum ages are l.3 x l06 yr, 9.7 x l05 yr, 3.4 x l05 yr, and 3.3 x l05 yr, respectively. In each case, the ages are greater than or equal to the cloud's free-fall collapse time. These four clouds are therefore either in a state of hydrostatic balance or have only recently begun to collapse, following an earlier period of hydrostatic support
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Journal Article
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Astrophysical Journal; ISSN 0004-637X;
; v. 281(1); p. 209-218

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[en] An method for preparing a coordination complex of isonitrile ligand and a radioisotope of Te, Ru, Co, Pt, Re, Os, Ir, W, Re, Cr, Mo, Mn, Ni, Rh, Nb and Ta from a non-radioactive metal adduct of the isonitrile
Source
4 Feb 1988; 5 Aug 1985; 18 p; ZA PATENT DOCUMENT 86/5828/A/; US PRIORITY 762,392; Available from the Patents Office, Private Bag X400, Pretoria, 0001, South Africa; Priority date: 5 Aug 1985
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Patent
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[en] A method is described for preparing a coordination complex of an isonitrile ligand and a radioactive metal selected from the class consisting of radioactive isotopes of Tc, Ru, Co, Pt, Fe, Os, Ir, W, Re, Cr, Mo, Mn, Ni, Rh, Pd, Nb and Ta. The method comprises preparing a soluble metal adduct of the isonitrile ligand by admixing the ligand with a salt of a displaceable metal having a complete d-electron shell selected from the class consisting of Zn, Ga, Cd, In, Sn, Hg, Tl, Pb and Bi to form a soluble metal-isonitrile salt, and admixing the metal isonitrile salt with a salt comprising the radioactive metal in a suitable solvent to displace the displaceable metal with the radioactive metal thereby forming the coordination complex
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17 Nov 1987; vp; US PATENT DOCUMENT 4,707,544/A/; U.S. Commissioner of Patents, Washington, D.C. 20231, USA, $.50
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Patent
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ADDUCTS, BISMUTH COMPLEXES, CADMIUM COMPLEXES, CHEMICAL COMPOSITION, CHEMICAL PREPARATION, CHROMIUM ISOTOPES, COBALT ISOTOPES, GALLIUM ISOTOPES, IMAGE PROCESSING, INDIUM COMPLEXES, IRIDIUM ISOTOPES, IRON ISOTOPES, ISONITRILES, LABELLED COMPOUNDS, LEAD COMPLEXES, LIGANDS, MANGANESE ISOTOPES, MERCURY COMPLEXES, MOLYBDENUM ISOTOPES, NICKEL ISOTOPES, NIOBIUM ISOTOPES, OSMIUM ISOTOPES, PALLADIUM ISOTOPES, PLATINUM ISOTOPES, RADIOISOTOPES, RHENIUM ISOTOPES, RUTHENIUM ISOTOPES, TANTALUM ISOTOPES, TECHNETIUM ISOTOPES, TELLURIUM COMPLEXES, TIN COMPLEXES, TUNGSTEN ISOTOPES, ZINC COMPLEXES
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No abstract available
Original Title
IK spektry pogloshcheniya tsianatnykh kompleksov metallov s benzoilgidrazinom
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For English translation see the journal Russ. J. Inorg. Chem.
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Zhurnal Neorganicheskoj Khimii; v. 20(5); p. 1281-1285
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[en] Isocyanic acid (HNCO) is a well-known interstellar molecule. Evidence also exists for the presence of two of its metastable isomers in the interstellar medium: HCNO (fulminic acid) and HOCN (cyanic acid). Fulminic acid has been detected toward cold and lukewarm sources, while cyanic acid has been detected both in these sources and in warm sources in the Galactic Center. Gas-phase models can reproduce the abundances of the isomers in cold sources, but overproduce HCNO in the Galactic Center. Here we present a detailed study of a gas-grain model that contains these three isomers, plus a fourth isomer, isofulminic acid (HONC), for four types of sources: hot cores, the warm envelopes of hot cores, lukewarm corinos, and cold cores. The current model is partially able to rationalize the abundances of HNCO, HOCN, and HCNO in cold and warm sources. Predictions for HONC in all environments are also made.
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Available from http://dx.doi.org/10.1088/0004-637X/725/2/2101; Country of input: International Atomic Energy Agency (IAEA)
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No abstract available
Original Title
Esquema de orbitais moleculares de um radical triatomico
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31. Annual Meeting of the Brazilian Society for the Advancement of Science; Fortaleza, Brazil; 11 - 18 Jul 1979; Published in summary form only.
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Journal Article
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Conference
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Ciencia e Cultura; ISSN 0009-6725;
; v. 31(7); p. 249

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No abstract available
Original Title
88.24 GHz, spontaneous emission
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Journal Article
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Astrophys. J., Lett; v. 187(2); p. L89-L91
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[en] In this paper, a potentiometric sensor based on polyaniline conducting polymer for potentiometric determination of Cr (VI) ions is reported. Polyaniline was synthesized electrochemically (cyclic voltammetry method) onto a micro pencil graphite electrode (0.7 mm diameter) in the presence of HCl and diphenylcarbazide (termed as (PGE/PAni/DPC). Some initial experiments were performed in order to find out the optimized conditions for preparation of the introduced Cr (VI) sensor electrode. The plot of E vs. log [Cr (VI)], showed a linear response in the range from 1.0 x 10-6 to 1.0 x 10-1 M. High repeatability with the detection limit of 8.0 x 10-7 M was obtained
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36 refs, 7 figs, 4 tabs
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Journal Article
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Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 33(4); p. 1247-1252

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[en] The stability constants of ZnII, CdII and MnII with 1-amidino-o-isobutylurea (ABiUH) in aqueous medium at different ionic strengths and temperatures using Calvin-Bjerrum technique as modified by Irving and Rossotti are reported. The values of thermodynamic stability constants have been evaluated
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3 refs., 1 tab.
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