The threshold-ion-pair-production (TIPP) spectra of H2S and D2S have been recorded in the vicinity H++SH?[X1?+(v?=0,1;J?)] D++SD?[X1?+(v?=0,1;J?)] thresholds using a tunable vacuum-ultraviolet laser cold molecular samples (Trot?20K) supersonic expansions. ion-pair-production signal was found to be much stronger at v?=0 than v?=1 thresholds. From rotational structure spectra, dominant photodisso...

Singly-charged complexes of (8S,9R)-tert-butylcarbamoylquinine (tBuCQN), N-3,5-dinitrobenzoyl-(S,R)-leucine (DNB-S/R-leucine), and alkali metal counter ions (Li(+), Na(+), K(+)) were investigated by density-functional theory. It is shown that the cations prefer formation of an ionic pair with the carboxylate group of DNB-Leu over the formation of a cation-π interaction. The [tBuCQN·DNB-S/R-Leu·...

A simple, precise, rapid and low-cost potentiometric method for diclofenac determination in pharmaceuticals is proposed. A new diclofenac-sensitive electrode was constructed by incorporating the diclofenac ion pair complex with butyl rhodamine B into graphite matrix. The electrode exhibited a linear response over the concentration range of 1 × 10-4 – 5 × 10-2 mol L-1, a detection limit of 3.9×1...

Low temperature plasma assisted nit riding treatments of 316 stainless steel produce a complex layer constituted by tow different metastable f.c.c. solid solution denoted ( γ N1 and γ N2 ). About the formation of these double layers, different hypothesis was proposed in the literature. For verifying these hypotheses, the effects of differentes conditions such as nit riding temperature, cleaning...

The stability of the mercury ion mediated dU-HgII-dU pair depends on substituents introduced at the 5-position of the pyrimidine moiety. To this end, a series of oligonucleotides were synthesized with dU modification in central position. Common and new phosphoramidites were utilized. Hybridization experiments provided 12-mer duplexes with non-canonical "dU-dU" pairs. In most cases Hg2+ stabiliz...