Inter- and intra- molecular hydrogen bonding plays important role in determining molecular structure, physical and chemical properties, which may be easily ignored for molecules with a non-typical hydrogen bonding structure. We demonstrated in this paper that the hydrogen bonding is responsible for the different Raman spectra in solid and solution states of p-Nitrothiophenol (PNTP). The consist...

Using an optimized KOH activation procedure we prepared highly porous graphene scaffold materials with SSA values up to 3400 m(2) g(-1) and a pore volume up to 2.2 cm(3) g(-1), which are among the highest for carbon materials. Hydrogen uptake of activated graphene samples was evaluated in a broad temperature interval (77-296 K). After additional activation by hydrogen annealing the maximal exce...

the influence of cation-π interactions on the strength and nature of intramolecular o...h hydrogen bond has been investigated by quantum chemical calculations in orthohydroxy benzaldehyde (hba) compound. ab initio calculations have been performed at mp2/6-311++g** level of theory. vibrational frequencies and physical properties such as chemical potential and chemical hardness of these compounds...

to identify the larvicidal activities of silver nanoparticles synthesized with acanthus ilicifolius (a. ilicifolius) leaf extract against the larvae of armigeressubalbatus and aedesaegypti. in vitro larvicidal activities such as lc50 and lc90 were assessed for the a. subalbatus  and ae.aegypti larval species. further, characterization using different techniques such as uv, sem,edax, xrd and fti...

PECVD Phosphorus-doped silicon oxynitride layers (n=1.5) were depositedfrom N20, 2%SiHdN2, NH3 and 5%PH3/Ar gaseous mixtures. Chemical bonds were determined by Fourier transform infrared spectrosco y N H bond concentration of the layers decreased from 3.29 X I @' to 0.45 x l & r ~ m ' 3 ~ a s the 5%PH3/Rr jlow rate increased from 0 to 60 sccm. A simultaneous decrease of 0 H related bonds was al...

We report direct evidence for the existence of an iron(IV)-hydroxide. Resonance Raman measurements on chloroperoxidase compound II (CPO-II) reveal an isotope ((18)O and (2)H)-sensitive band at nu(Fe-O) = 565 cm(-1). Preparation of CPO-II in H(2)O using H(2)(18)O(2) results in a red-shift of 22 cm(-1), while preparation of CPO-II in (2)H(2)O using H(2)O(2) results in a red-shift of 13 cm(-1). Th...

statement of the problem: hemostatic agents may influence the bond strength of different bonding agents. also, chlorhexidine has shown positive effects on bond strength values and their combination effect has not been reported yet. purpose: the aim of this study was to evaluate the effect of contamination with a hemostatic agent on shear bond strength (sbs) of total- and self-etching adhesive s...

The word tomography comes from the Greek words tomo (tomos: a slice or cross section) and grafein (graphein: to write). It means a technique for producing cross-sectional images, usually of the human body for medical diagnostics, but it is also used in many other applications. The data acquired by X-ray scans of biological tissues and other materials is essentially a set of projections—the shad...

Vibrational relaxation of methanol-d ~MeOD! in carbon tetrachloride has been investigated via ultrafast infrared pump–probe experiments. Exciting at 2690 cm, only the free O-D ~where the D is not H-bonded! stretching mode is initially populated. For MeOD mole fractions <0.025, a 2.15 ps single exponential decay is observed. At mole fractions >0.0375, the signal decays ~2.15 ps decay time! below...