UV Spectral Measurements Research Articles

ChemInform Abstract: Synthesis and IR, UV, NMR (1H and 11B), and Mass Spectral Studies of New β‐Ketoamine Complexes of Boron: Crystal and Molecular Structure of Bicyclic OC6H4OBOC(R)CHC(R′)NR′′ (R: p‐ClC6H4, R′: C6H5, R′′: CH3).

AbstractThe new β‐ketoamine complexes (III) of boron are synthesized as shown and tetrahedral geometry is assigned by their IR, UV, and NMR spectral and other physicochemical measurements.

回折格子モノクロメータの二次回折光を用いた紫外域分光感度の測定

回折格子モノクロメータの二次回折光を用いた紫外域分光感度の測定

Concentration effect of photostabilizers on poly(1-butene) film

Effect of addition of various concentrations of stabilizers on poly (1-butene) [IPB] film has been studied, by measuring rate of protection and protective effectiveness through light scattering technique and UV spectral measurements. It has been observed that after a certain percentage of stabilizer addition there was not any further change.

A spectrophotometer cell for UV spectral measurements of liquids at high temperatures and pressures

A spectrophotometer cell is described which can be used for fluorescence or absorption measurements of organic solvents or liquids in the UV or visible range. The cell can withstand pressure as high as 20-25*105 Pa, and is suitable for measurements in the temperature range from about 20 degrees C to 230 degrees C. It can also be easily dismantled for cleaning purposes and can be conveniently coupled to a deoxygenation system. A suitable sample cell holder is also described.

Complexes of antimony pentachloride with some 4-substituted pyridine N-oxides

The complexes SbCl 5·L (where L = 4-methoxypyridine N-oxide, 4-chloropyridine N-oxide, 4-cyanopyridine N-oxide, 4-nitropyridine N-oxide and 3-ethyl carboxilatepyridine N-oxide) have been isolated and investigated by conductivity, UV and IR spectral measurements. The IR spectra in the range 600–250 cm −1 are consistent with a C 4u symmetry. The NO stretching vibration was insensitive to the substituent variations in the complexes with 4-Z-pyO ligands (where Z = CH 3O, CH 3, H, Cl, CN, NO 2). There is no linear correlation between the Sb-O stretching modes and the σ PyO parameters. A better correlation of the latter with the ππ* ligand band position was found.

Photo-crosslinkable polymers with benzylideneacetophenone (chalkone) structure in the side chains

Four soluble types of polymers have been synthesized by grafting 4- and 4′-chalkonyl glycidyl ethers onto an aromatic polyamine (aniline–formaldehyde linear resin) and a polyamide (condensation product of dimerized linseed oil and an aliphatic polyamine) to obtain photo-crosslinkable chalkone structure in the side chains which are also expected to contain one OH group each. The completion of grafting reactions has been followed by the disappearance of the epoxide absorption around 918 cm−1. The characterization of the resins was done by melting point, solubility, and IR measurements. Irradiation was carried out with a 100-watt Hanovia high-pressure mercury are lamp. Irradiated samples were studied by UV spectral measurements and their insolubility in CHCl3. It was observed that polymers grafted with 4′-chalkonyl glycidyl ether possibly undergo both isomerization and crosslinking reactions under UV irradiation while those grafted with 4-chalkonyl glycidyl ether undergo crosslinking reaction predominantly.

Derivatographic Studies on Transition Metal Complexes. IV. Deaquation-Olation of Hydroxoaquo Cobalt(III) Complexes with Aminotricarboxylic Acids.

Abstract Thermochemical functions of the deaquation-olation on K[Co(OH)L4(H2O)] type complexes in the solid phase were determined by means of derivatography and UV spectral measurements and the mechanisms were discussed on the basis of the results. In the above formula, L4, denotes nitrilotriacetate (nta), nitriloisopropionicdiacetate (nipda), d,l-α-amino-n-butyric-N,N-diacetate (α-abda), l-leucine-N,N-diacetate (lda), l-valine-N,N-diacetate (vda), d-α-phenylglycine-N,N-diacetate (pgda), or d,l-α-phenylalanine-N,N-diacetate (pada) ions. These complexes were found to liberate one mole of coordinating water upon heating and to turn into the olated compound bridged with two OH groups at the same time. From an estimation of enthalpy change and activation energy for the reaction, it was found that the reaction is apt to take place more easily as the structural complexities of chelating agents increase and that the reaction always proceeds in the first order. We might conclude that the evolution of coordinating water is the rate-determining step in the reaction.

The applicability of hammett acidity functions to substituted pyridines and pyridines 1-oxides

The compounds named in the title have been investigated to determine whether the H 0 value of their solutions in strong sulphuric acid gives the amount of free base present using the H 0 function equation. Innovations in the experimental procedure afford greater accuracy than in previous similar UV spectral measurements. In general, these compounds are Hammett bases.