The *H N M R spin-lattice relaxation time 7 \ , C1 NQR frequency VQ, and C1 NQR spin-lattice relaxation time 7 \ Q of [ Z n ( H 2 0 ) 6 ] [SnCl6] (zinc hexachlorostannate(IV) hexahydrate) have been measured at temperatures between 77 and 350 K. The NQR spin echo signal with Vq— 15.689 MHz at 77 K showed a positive temperature coefficient attributable to O H C l type H-bonds in the crystal. vQ a...

Crystalline stanous chloride dihydrate (SCD), more descriptively named dichloroaquatin(II) monohy­ drate SnCl2(OH2) • H20 [1, 2], is not a very stable compound. The vapour pressure of its crystal water is appreciable already at room temperature. If the com­ pound is stored in a dry atmosphere or under vacuum it quickly loses water and becomes highly reactive at its surface. One of the usual met...

The purpose of this report is to describe what progress was made in defining and explaining the phenomenon of NQR and to stress some functional roles of this type of release, as based on our own data and other observations.

Gentisate 1,2-dioxygenase catalyzes the oxygenolytic ring cleavage of gentisate (2,5-dihydroxybenzoate) between carbons 1 and 2 to form maleylpyruvate. The essential active site Fe2+ of the enzyme binds NO to yield an EPR-active (S = 3/2) complex. Hyperfine broadening from 17O (I = 5/2) is observed in the spectrum of the enzyme-nitrosyl complex prepared in 17O-enriched water, demonstrating that...

A structural characterization of the hydrated form of the brownmillerite-type phase Ba2In2O5, Ba2In2O4(OH)2, is reported using experimental multinuclear NMR spectroscopy and density functional theory (DFT) energy and GIPAW NMR calculations. When the oxygen ions from H2O fill the inherent O vacancies of the brownmillerite structure, one of the water protons remains in the same layer (O3) while t...

The Na(+)-pumping NADH:quinone oxidoreductase (Na(+)-NQR) is the main entrance for electrons into the respiratory chain of many marine and pathogenic bacteria. The enzyme accepts electrons from NADH and donates them to ubiquinone, and the free energy released by this redox reaction is used to create an electrochemical gradient of sodium across the cell membrane. Here we report the role of glyci...