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131.
132.
冠醚化二苯甲酮的合成及其光物理行为 总被引:1,自引:0,他引:1
本文报道采用在多聚磷酸中酰化的方法,合成了冠醚化二苯甲酮1~8。它们与叔胺类共用可能被用作光引发剂。为此,用紫外光谱详细研究了这些化合物及其络合后的光物理行为。还提及化合物3和4作为紫外吸收剂的可能性。 相似文献
133.
Yu.?V.?PleskovEmail author M.?D.?Krotova V.?G.?Ralchenko A.?V.?Khomich R.?A.?Khmelnitskii 《Russian Journal of Electrochemistry》2005,41(3):304-309
The photocurrent and photopotential for undoped polycrystalline diamond film electrodes prepared by chemical vapor deposition and annealed in vacuum at 1500–1640°C are measured. The metal-like samples (annealed at 1630°C) have a negligible photosensitivity. Judging from the positive sign of the photopotential and the cathodic direction of the photocurrent, the material under study formally behaves as a p-type semiconductor. The photoeffects are presumably caused by structure defects, in particular, the dislocations in diamond crystallites formed close to intercrystalline boundaries during the high-temperature annealing.Translated from Elektrokhimiya, Vol. 41, No. 3, 2005, pp. 343–349.Original Russian Text Copyright © 2005 by Pleskov, Krotova, Ralchenko, Khomich, Khmelnitskii. 相似文献
134.
K. H. C. Baser H. R. Nuriddinov T. Ozek B. Demirci N. Azcan A. M. Nigmatullaev 《Chemistry of Natural Compounds》2002,38(1):51-53
The herbal parts of Arischrada korolkowii (Regel et Schmalh.) Pobed. (Lamiaceae) growing in Uzbekistan were hydrodistillated to yield 1.1% of essential oil. The essential oil was analyzed by GC/MS. Eighty eight compounds were characterized representing 98% of the essential oil with 1,8-cineole (29.3%), camphor (9.8%), -caryophyllene (8.5%), bornyl acetate (7.7%), caryophyllene oxide (7.2%), and borneol (5.6%) as the main constituents. 相似文献
135.
The harmonic vibrational force fields and the IR spectrum of XSO2NCO (X= F, C1) molecules have been studied usingab initio HF/SCF method with the 6-31G’ basis set. Theab initio harmonic force fields are scaled empirically using the scaled quantum mechanical (SQM) method of Pulay. A set of scale factors
are optimized by the least-squares fitting to the experimental frequencies of FSO2NCO and then are transferred to CISO2NCO to give ana priori prediction of its fundamental frequencies. The average deviations between the theoretical frequencies and the experimental
values for FSO2NCO and C1SO2NCO are 3 and 5 cm-1, respectively. The assignments of the fundamentals for these two molecules are also made atcording to the potential energy
distributions and theab initio IR intensities
Project supported by the National Natural Science Foundation of China (Grant No. 29673029) 相似文献
136.
Z. S. Klemenkova B. V. Lokshin L. I. Strunkina M. Kh. Minacheva 《Russian Chemical Bulletin》1994,43(9):1516-1521
Raman and IR spectra (4000-50 cm–1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2MH2, Cp2MD2, Cp2Zr(H)X, and Cp2Zr(D)X (Cp = 5-C5H5; M = Zr, Hf; X = Cl, Br) have been studied. The vibrational modes of MH groups, Cp-rings, and metal-ligand bonds are discussed and the band assignments are proposed. In the solid state, these complexes form polymers with linear hydride bridges of the M-H-M type. The force constants of the M-H and M-Cp bonds increase on going from Zr to Hf.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1604–1609, September, 1994. 相似文献
137.
A.?I.?Yusipovich S.?Yu.?VassilievEmail author 《Russian Journal of Electrochemistry》2005,41(5):510-521
Basic regularities of electrochemical processes in the gap of an ex situ scanning tunneling microscope in conditions of condensation of air moisture at the sample surface are considered on a qualitative level. A layer of condensed moisture is viewed as an electrolyte in a two-electrode cell. The depolarizers present in this layer may experience electrochemical conversions on the tip and in an area of the sample surface near the tip. As a result, the recorded “tunneling” current includes electrochemical constituents. Depending on the electrochemical processes in the gap, various dependences of the tip-sample distance on the current and applied voltage can be expected. For preliminary diagnostics of processes in the gap it is suggested to use voltage-height spectra, whose shape and characteristic heights are sensitive to the nature and location of redox active species. Experimental data for various films on conducting supports (quasi-two-dimensional adsorbed layers of hemin and peroxidase, electrodeposited nonstoichiometric tungsten oxides, doped tin dioxide, solid electrolyte with ionic conduction) are presented as an examples.__________Translated from Elektrokhimiya, Vol. 41, No. 5, 2005, pp. 583–595.Original Russian Text Copyright © 2005 by Yusipovich, Vassiliev. 相似文献
138.
A polyphosphide of the type (NaP)X 1 was obtained from red phosphorus and sodium in presence of small amounts of naphthalene in 1,2-dimethoxyethane as solvent. 1 reacts with alkyl halides in dependence on the kind of alkyl group with formation of different alkylcyclophosphanes. As definite compounds Me5P5 2 , Et5P5 3 (with not definite constitution), i-Pr4P4 4 and t-Bu4P4 5 could be isolated. 1 was identified by X-ray diffraction, 2 – 5 by means of their 1H, 13C, 31P n.m.r. and mass spectra. The molecular structure of 4 was identified by electron diffraction. 相似文献
139.
[Co(amp)2Cl2]2[ZnCl4]体系中两对称异构体的2D NMR研究 总被引:7,自引:0,他引:7
The two symmetrical isomers in [Co(amp)2Cl2]2[ZnCl4](amp=2-(Aminomethyl)pyridine) system were syn-thesized by general oxidation method and were separated by chromatography and recrystallization method. Their configurations were assigned by using 2D NMR techniques, particularly the NOESY NMR spectra. Solvent used was Me2SO-d6 with the central peak of the CD3 septet as the reference ( 13C,δ 39.37; 1H,δ 2.49 relative to SiMe4). Cation exchange media used was Dowex 50Wx 2(H+ form, 200~400mesh; Biorad). 相似文献
140.