Nickel(II) and Palladium(II) Bis(polychelate) Complexes as Promising Compounds for Piezoelectric Moisture Detectors

The interaction of binuclear nickel and palladium complexes with water vapor was studied by the piezoquartz microbalance technique. These compounds may be used as active coatings of threshold devices generating an analytical signal at low relative humidities.     

Gravimetric And Quantum-chemical Study of Interaction of Monoethanolamine Vapor With Silica Surface

Kinetics of the monoethanolamine vapor adsorption on the surface of silica previously deposited onto quartz plate was examined by the piezoelectric microweighing. With the assumptions which are in accord with the experimental data, the kinetic equation of the process was obtained and thus the adsorption and desorption constants were found. The structure of the possible adsorption complexes was studied in the framework of the quantum-chemical MNDO method and the conclusion was made that the two-center adsorption of the monoethanolamine on the silica surface proceeds as a two-stage process with the participation of both functional groups. The bonding is mainly effected owing to the proton-acceptor properties of amine groups. This revised version was published online in August 2006 with corrections to the Cover Date.     

Heterophase Reactions of Hydrazine Vapor with Copper(I) π-Complexes at the Surface of a Piezoelectric Quartz Crystal

Quartz Crystal Microbalance (QCM) was used to study heterophase reactions of hydrazine vapor with solid copper(I) -complexes Cu₂Cl₂ · DVB, CuCl · AA, (HDAA)CuCl₂, and Cu(HMA) · H₂O (where DVB is CH₂=CH-C₆H₄-CH=CH₂, AA is CH₂=CH-CH₂-NH₂, HDAA is (CH₂=CH-CH₂)₂NH₂ ⁺, and HMA is the HOOC-CH=CH-COO^-. It was found that all the complexes can add hydrazine reversibly. However, in contrast to ionic complexes, molecular complexes gradually decomposed while reacting with the vapor of N₂H₄. The kinetic parameters such as the rate constants of forward and reverse heterophase reactions were determined. Complex Cu(HMA) · H₂O was found to be most sensitive to the vapor of N₂H₄.