17083-68-0Relevant articles and documents
Halogen impact into new oxonium benzo-crown ether complexes with tetrachloro- and tetrabromoaurates(iii)
Pluzhnik-Gladyr, Sergei M.,Kravtsov, Victor Ch.,Fonari, Marina S.,Kamalov, Gerbert L.
, p. 7087 - 7095 (2014)
Five oxonium tetrahalogenaurate(iii) (Hal = Cl, Br) benzo-crown ether (BCE) complexes are prepared and reported. The new compounds are [(H 3O)(B18C6)0.58(4′-Cl-B18C6)0.42] [AuCl4] 1, [(H3O)(B18C6)][Au
Investigation of thermal properties of double complex salts [M(NH3)5Br][AuBr4]2-nH2O, M 5 Rh, Ir
Semitut, E. Yu.,Plyusnin, P. E.,Shubin, Yu. V.,Veniaminov, S. A.,Korenev, S. V.
, p. 901 - 906 (2012/10/08)
Novel double complex salts [M(NH3)5Br] [AuBr4]2-nH2O, M =Rh, Ir, have been synthesized and examined. The processes of thermal decomposition of the compounds in inert and reductive atmospheres have been studied and intermediate products identified. Simultaneous thermal analysis with parallel mass-spectrometric analysis of evolved gases (STA-EGA) has been employed for identification of main gaseous products of thermolysis in inertatmosphere. It has been revealed that the final products of decompositi on in inert or reductive atmospheres are fine powders of gold and the corresponding platinum metal with sizes of crystallites 4-40 nm. The possibility of preparation of the metastable solid solution Au0.05Ir0.95 on thermolysis of [Ir(NH3)5Br][AuBr4]2-H2O in inert atmosphere has been demonstrated.
1H NMR and 35Cl NQR Studies on the Motion of Pyridinium Ions in Crystalline Pyridinium Tetrachloro- and Tetrabromoaurate(III): (pyH)AuX4 (X = Cl, Br)
Ito, Yukari,Asaji, Tetsuo,Ikeda, Ryuichi,Nakamura, Daiyu
, p. 885 - 891 (2007/10/02)
The temperature dependence of 1H spin-lattice relaxation times T1 at the Larmor frequencies of 10.5, 16.0, 20.0, and 45.5 MHz, and of 1H NMR second moments M2 were determined for (pyH)AuCl4 and (pyH)AuBr4, where pyH(+) indicates a pyridinium ion.The small M2 data less than 1 G2 obtained above ca. 380 K indicated that the cations perform reorientational motion rapidly enough about its pseudohexad C'6 axis existing at the center of the cation and perpendicular to its plane.Below 140 K, both complexes yielded rigid lattice M2 values of the cation.It is interesting features for these complexes that motional narrowing for the NMR line occurs over an extremely wide range of temperature, the log T1 vs.T-1 plots are asymmetric about the 1H T1 minimum with a gentler gradient on the low temperature side, and the minima are extraordinarily long.These unusual results were interpreted by assuming the C'6 reorientation of the cations having electric dipoles among nonequivalent in-plane orientations.Three potential barriers to the C'6 reorientation were determined as 21.8, 17.2, and 13.5 kJ mol-1 for (pyH)AuCl4, and 22.2, 17.4, and 13.7 kJ mol-1 for (pyH)AuBr4.The fade-out phenomenon of 35Cl NQR signals observed for (pyH)AuCl4 at ca. 230 K when the sample temperature was lowered is also discussed, by referring to the motion of the pyridinium cations. - Complex Compounds / Crystal Structure / Molecular Dynamics / Spectroscopy, Nuclear Magnetic Resonance / Spectroscopy, Nuclear Quadrupole Resonance
