Reference

Crystal hydrates: an investigation of the use of crystal hydrates as stationary phases in gas chromatography

Crystal hydrates: an investigation of the use of crystal hydrates as stationary phases in gas chromatography. Berezkin, V. G.; Alishoev, V. R.; Viktorova, E. N.; Gavrichev, V. S.; Fateeva, V. M. (A.There are some reagents with their cas registry numbers 7732-18-5 and 7784-27-2 are used in this study. V. Topchiev Inst. Petrochem. Synth., Moscow, USSR). Chromatographia, 16, 126-31 (English) 1982. CODEN: CHRGB7. ISSN: 0009-5893. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 80 The use of crystallohydrates, crystallohydrate solns., and melts as stationary phases in gas chromatog. is proposed. Crystallohydrates display high selectivity in the sepn. of polar org. compds. when use is made of H2O vapor as the mobile phase. Some aspects of gas-liq. chromatog. in water vapor and with the stationary phase crystallohydrates were studied. .

EPR spectroscopy of chromium(3+) ions and exchange-coupled chromium(3+)-chromium(3+) pairs in aluminum nitrate

EPR spectroscopy of chromium(3+) ions and exchange-coupled chromium(3+)-chromium(3+) pairs in aluminum nitrate. Gataullin, O. F.; Zaripov, M. M.; Ryzhmanov, Yu. M. (Kazan. Fiz.-Tekh. Inst., Kazan, USSR). Fiz. Tverd. Tela (Leningrad), 25(11), 3304-8 (Russian) 1983. CODEN: FTVTAC. ISSN: 0367-3294. DOCUMENT TYPE: Journal CA Section: 77 (Magnetic Phenomena) Section cross-reference(s): 78 Between neighboring ions of Cr3+ implanted in a matrix of [Al(H2O)6](NO3)3.3H2O, isotropic antiferromagnetic interaction with the exchange integral J ~ -70 ′ 10-4 cm-1 takes place. In exchange-coupled Cr3+-Cr3+ pairs, complexes with identical local symmetry participate, with the axis of the pair (r ~ 7.35 ?) situated parallel to the (100) plane under an angle ~42° to the c-axis. Indirect exchange interaction is achieved through a bridged structure from 2 H bonds with participation of unshared pairs of electrons of the O atom of an uncoordinated H2O mol. Relations are presented which allow, in terms of the construction of the bridge including only H bonds, taking into account the electron configuration of ions with half-integral spins, to est. 7784-27-2 and 88363-68-2 are just another two chemicals used in this study. the exchange integral. .