Detail of "7439-94-3"

Reference

Lutetium-176 - an s-process thermometer

Lutetium-176 - an s-process thermometer. Klay, N.; Kaeppeler, F.; Beer, H.; Schatz, G. (Kernforschungszent. Karlsruhe, Karlsruhe, Germany). AIP Conf. Proc., 238(Capture Gamma-Ray Spectrosc.), 850-9 (English) 1991. CODEN: APCPCS. ISSN: 0094-243X. DOCUMENT TYPE: Journal CA Section: 70 (Nuclear Phenomena) Any interpretation of 176Lu as a cosmic clock is strongly dependent on the conditions at the stellar site, a problem that cannot be solved reliably enough with present stellar models. Instead, the strong temp. dependence of the 176Lu half-life makes it a sensitive tool for constraining the s-process temp. to the range between 2.4 . 108 to 3.6 . 108 K.

Electrochemistry of a Double-Decker Lutetium(III) Phthalocyanine in Aqueous Media

Electrochemistry of a Double-Decker Lutetium(III) Phthalocyanine in Aqueous Media. The First Evidence for Five Reductions. Kadish, Karl M.; Nakanishi, Takashi; Guerek, Ayseguel; Ahsen, Vefa; Yilmaz, Ismail (Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA). Journal of Physical Chemistry B, 105(40), 9817-9821 (English) 2001 American Chemical Society. CODEN: JPCBFK. ISSN: 1089-5647. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 29 The double-decker lutetium(III) phthalocyanine, Lu[(RS)4Pc]2, where R = C12H25, was synthesized and electrochem. characterized under several soln. conditions. The neutral complex undergoes a single reversible one-electron oxidn. and up to four reversible one-electron redns. in nonaq. solns. of CH2Cl2 or benzonitrile contg. 0.1 M tetra-n-butylammonium perchlorate (TBAP), while one oxidn. and five redns. are seen in aq. 0.5 M KCl for a gel-like cast film membrane of Lu[(RS)4Pc]2 in a tetraoctylphosphonium bromide (4C8P+Br-) matrix at a basal plane pyrolytic graphite electrode. The half-wave potentials for redn. of Lu[(RS)4Pc]2 in CH2Cl2, 0.1 M TBAP are located at E1/2 = 0.04, -1.03, -1.36 and -1.73 V, while the single oxidn. is located at E1/2 = 0.43 V vs SCE. These potentials, when measured vs Fc/Fc+, are neg. shifted by 0.20-0.46 V from the E1/2 values obtained in the 0.5 M KCl soln. where the electrogenerated anions of the double-decker complex are stabilized by the cations of the 4C8P+Br- matrix and five redns. are seen at E1/2 = 0.29, -0.66, -0.94, -1.22, and -1.41 V vs SCE. The fifth redn. has been theor. 1923-70-2 which is the cas registry number is also used here. predicted but had never before been obsd. for any double-decker lutetium(III) phthalocyanine or related complex. A cast film of Lu[(RS)4Pc]2 displays only one oxidn. in the 0.In this study，1923-70-2 is also used.5 M KCl soln. (at E1/2 = 0.78 V vs SCE), and no redns. at all are seen in the absence of a matrix. An almost identical oxidn. potential of E1/2 = 0.80 V is seen for oxidn. of Lu[(RS)4Pc]2 in KCl when dissolved in the cationic matrix. These half-wave potentials for oxidn. in the cationic film, when measured vs Fc/Fc+, are thus more pos. by more than 0.27-0.32 V than E1/2 values measured in CH2Cl2 or PhCN and this is consistent with a decreased degree of solvent or anion binding to {Lu[(RS)4Pc]2}+ in the 4C8P+Br- matrix, as compared to what is obsd. in soln. ..