Combined low-temperature NMR/UV-vis spectroscopy (UVNMR), where optical and NMR spectra are measured in the NMR spectrometer under the same conditions, has been set up and applied to the study of H-bonded anions A··H··X(-) (AH = 1-(13)C-2-chloro-4-nitrophenol, X(-) = 15 carboxylic acid anions, 5 phenolates, Cl(-), Br(-), I(-), and BF(4)(-)). In this series, H is shifted from A to X, modeling th...

Two types of photoreceptors are found in the median ocellus of Limulus. One type is maximally sensitive to ultraviolet (UV) light, the other to green light; they are called UV and VIS cells, respectively. Biphasic receptor potentials, consisting of a small initial hyperpolarizing phase and a later slow depolarizing phase, can be recorded from both receptor types. These biphasic responses are el...

Transmission electron microscopy (TEM) observations were conducted on a CM 120 transmission electron microscope (Philips, Netherlands) at an acceleration voltage of 80 kV. Scanning electron microscopy (SEM) images were obtained on a TS-5136MM scanning electron microscope (Tescan, Czech) at an accelerating voltage of 20 kV. Ultraviolet-visible (UV-Vis) absorption spectra were measured on a UV-25...

Investigations into V-agent interaction with 1,10-phenanthroline nitrate Ln(III) complexes (Eu and Tb) were carried out using luminescence and UV-Vis spectroscopy. Addition of several equivalents of agent resulted in the loss of luminescence intensity and the observation of free 1,10-phenanthroline by UV-Vis. We propose a displacement mechanism in which the V-agent acts as a bidentate ligand to...

A dynamic combinatorial library of metal-dye complexes was obtained by reacting aqueous solutions of the dyes Methyl Calcein Blue, Arsenazo I, and Xylenol Orange with CuCl(2) and NiCl(2). The mixture gave a characteristic UV-Vis response upon addition of the peptide hormones angiotensin I and angiotensin II. This allowed distinguishing pure samples of peptide hormones from mixtures. The discrim...

Department of Chemistry, Wuhan University whu.edu.cn; Fax: +86 27 6875 6757 Institute of Chemistry, The Chinese Academ Fujian Institute of Research on the Struct Sciences, Fuzhou 350002, China † Electronic supplementary information dendrimers in the previous study and th compounds, NLO measurements inclu preparation of thin lms, measurement c mechanics simulation including calculat TOF mass sp...

Two new classes of dendrimers bearing 8 and 32 fluorene donor groups have been synthesized. The first and second generations of these porphyrin-PAMAM-fluorene dendrimers were characterized by 1H-NMR, 13C-NMR, FTIR, UV-vis spectroscopy, elemental analyses and MALDI-TOF mass spectrometry. The UV-vis spectra showed that the individual properties of donor and acceptor moieties were preserved, indic...

UV–VIS spectroscopy is applied to study the structural and especially morphological particularities of silver nanoclusters-phosphate glass composites from the dispersed phase perspective. The electronic absorption measurements performed on several types of phosphate glasses with different Ag2O content indicate the existence of both silver nanoparticles of various dimensions and shapes, and Ag i...

Analytical methods based on spectroscopic techniques were developed and validated for the determination of diethyl phthalate (DEP) and polyhexamethylene guanidine (PHMG), which may occur in unrecorded alcohol. Analysis for PHMG was based on UV-VIS spectrophotometry after derivatization with Eosin Y and (1)H NMR spectroscopy of the DMSO extract. Analysis of DEP was performed with direct UV-VIS a...

In the present work, the ZnFe2O4 nanoparticle has been successfully synthesized. The obtained sample was characterized by X-ray diffraction (XRD), emission scanning electron microscopy (FE-SEM) and its optical property was examined by UV-Vis spectrophotometer. FE-SEM revealed that the particle size of the ZnFe2O4 of about 47 nm was synthesized. The photocatalytic performance under UV-Vis and vi...