ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Dehydrated zeolites NaA, NaY, and barium-exchanged NaY luminesce when irradiated with the 1064 nm laser light of an FT-Raman instrument. When hydrogen is adsorbed in the zeolite, the luminescence is altered in several ways. Most remarkable is the appearance of "absorptions" in the positions of the first vibrational overtones of H(2) and HD. Although these features are in the expected positions with reasonable band profiles for overtone absorptions, the large extinction of the luminescent intensity requires a more efficient mechanism than simple reabsorption of emitted photons. In addition to the appearance of holes in the luminescence spectrum, other luminescent features are substantially quenched by the presence of hydrogen or, in one case, augmented.

Lanthanide füllende SmxC60 films were prepared by metal vapor synthesis and the valence state of the C60 cage in the films was investigated by infrared transmission spectroscopy. Three films with different doping contents of Sm showed red-shift frequencies of Fiu(4) at 1347, 1362 and 1392 (1411) cm−1, respectively, indicating that the major phase with corresponding valence state n≈ −5, −3 and −1 might exist in the films. The other major additional feature of activated pentagonal pinch mode Ag(2) was observed at 1445 or 1448 cm−1 in the films, which suggested that the Sm atoms might bond to the five-membered ring of the C60 cage and ferrocene-like SmxC60 complexes might be formed.

H-2-doped argon matrices containing CsF were examined using FTIR with 1 cm(-1) spectral resolution. Several distinct trapping sites were identified with one, two, and three hydrogen molecules perturbed by CsF. CsF(H-2) gives a band at 4022 cm(-1) while the features of CsF(H-2)(x), x > 1, are displaced to higher wavenumbers. It is clear from the similarity of the spectra of H-2 and HD that the rotation of H-2 is quenched in the presence of CsF, Analogous spectra are observed using KF with the 1:1 adduct absorbing at 4016 cm(-1) The spectrum of H-2 in argon matrices doped with NaCl shows three absorptions that exhibit fine structure even under highly dilute conditions, Analogous features are exhibited by HD, indicating that the several bands are probably not due to rotation of the hydrogen. The three bands are assigned to conformers of NaCl:H-2 which are differentiated by an interaction between the sodium ion and H-2 that is modulated by the matrix.

Transition metal and lanthanide fullerides MxC60 films (M=Ag, Au, Al, In, Sn, Pb and Sm) were prepared by metal vapor synthesis. The UV-NIR absorption spectra and infrared transmission spectra of MxC60 suggested that charge transfer occurred and bonds formed between metals and C-60. The IR spectra of these fullerides showed two new major features located at 1369-1401 and 1441-1451 cm(-1), respectively. The former could be the softing mode of F-1u(4) induced by charge transfer, which suggested that the C-60 cage was between 1- and 3-(+/-1) charged in these fullerides at present synthesis conditions. The latter could be A(g)(2) mode activated in the IR by disorder. The metal atoms may be as a bridge connecting C-60 molecules like a linear polymer or bridged binuclear complexes for M=Ag, Au, Al, In, Sn and Pb). For lanthanide fulleride SmxC60, the Sm atoms may be bounded to the five-membered ring of the C-60 cage and ferrocene-like SmxC60 complexes may be formed.

Dihydrogen has been codeposited with alkali halides in argon matrices at similar to 10 K. The presence of the alkali halide induces infrared activity which is assigned to the H-H stretching vibration that is red-shifted by as much as 114 cm(-1) from the position of the Q branch vibration of o-H-2 in argon. The observations suggest that it is the anion of the alkali halide ion pair which is responsible for the perturbation of H-2. Thus, the largest perturbations have been recorded for KF and CsF while the perturbation due to RbNO3 is not nearly as great as that for RbCl. Moreover, the position of the perturbed H-H stretch is quite insensitive to the size of the cation in the series of all;ali chlorides. The extent of perturbation on the H-H stretch has been found to be greater for alkali halide monomers than for aggregates.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Ultraviolet irradiation (lambda = 254 nm) of argon matrices containing BBr3 and high concentrations of H-2 produces an intermediate, BBr2, which reacts with H-2 to form HBBr2, H2BBr, and HBr. The intermediate is completely destroyed by irradiation at 680 nm, the position of a broad absorption band, producing the same hydrogenation products that form by using ultraviolet radiation. The reaction of BBr2 with HD gives HBr and DBBr2 1.6 times more readily than DBr and HBBr2. The spectrum of BBr2 has been reported earlier; herein we reassign the totally symmetric B-Br stretching mode to a weak band at 551.0 cm-1. There is no evidence that either BBr2 or BBr3 forms a ground-state complex with hydrogen in spite of the fact that BBr2 forms more readily in the presence of H-2 and that it is readily converted into HBBr2 and H2BBr by H-2. However, a complex of hydrogen and BBr2 in its first excited state may lead to the hydrogenation products. The yield of H2BBr is greatest when the concentration of hydrogen in the matrix is greater than about 10 mol %. Both hydrogen atoms that make up the H2BBr come from the same molecule of hydrogen. MixtureS of H-2 and D2 give H2BBr and D2BBr with only a trace of HDBBr whereas matrices containing HD produce only HDBBr.

HCo(CO)4 has been observed by Raman spectroscopy in acetonitrile at -26-degrees-C in the presence and absence of 2,4-dichloroaniline. Although HCo(CO)4 is substantially deprotonated by the aniline, there is no evidence of a hydrogen bond between the excess aniline and the remaining hydride. Matrices containing HCo(CO)4 and a polar molecule such as acetonitrile, water, ammonia, or trimethylamine have also been examined by infrared and Raman spectroscopy. Prior to proton transfer, which occurs on heating, there is little interaction between the base and the hydride ligand. The only observed perturbation of a vibrational mode was that of the H-Co deformation when the strongest base examined, Me3N, was present. This evidence, along with the large infrared intensity of the deformation mode, suggests that the deformation coordinate may play a large role in the transfer of a proton from HCo(CO)4.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVan der Waals complexes between Lewis bases and molecular hydrogen in argon matrixesAntoni. Moroz, Ray L. Sweany, and Scott L. WhittenburgCite this: J. Phys. Chem. 1990, 94, 4, 1352–1357Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1 February 1990https://doi.org/10.1021/j100367a030Request reuse permissionsArticle Views199Altmetric-Citations27LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (839 KB) Get e-Alerts

ChemInformVolume 20, Issue 33 Preparative Organic Chemistry ChemInform Abstract: Photolysis of Amminepentacarbonylchromium in Hydrogen-Containing Matrices: Characterization of an H-H Stretching Vibration in Matrices. R. L. SWEANY, R. L. SWEANY Dep. Chem., Univ. New Orleans, New Orleans, LA 70148, USASearch for more papers by this authorA. MOROZ, A. MOROZ Dep. Chem., Univ. New Orleans, New Orleans, LA 70148, USASearch for more papers by this author R. L. SWEANY, R. L. SWEANY Dep. Chem., Univ. New Orleans, New Orleans, LA 70148, USASearch for more papers by this authorA. MOROZ, A. MOROZ Dep. Chem., Univ. New Orleans, New Orleans, LA 70148, USASearch for more papers by this author First published: August 15, 1989 https://doi.org/10.1002/chin.198933089AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume20, Issue33August 15, 1989 RelatedInformation

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of tetracarbonylnickel in dihydrogen-containing matrixes. Evidence for the formation of a complex of molecular hydrogenRay L. Sweany, Michael A. Polito, and Antoni MorozCite this: Organometallics 1989, 8, 10, 2305–2308Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published inissue 1 October 1989https://doi.org/10.1021/om00112a003RIGHTS & PERMISSIONSArticle Views87Altmetric-Citations11LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (547 KB) Get e-Alerts Get e-Alerts

AbstractThe UV photolysis of the title compound (I) in argon matrices produces (II) which rearranges to form (III) upon subsequent irradiation.