Synthesis of phosphorus-substituted dialkylamides of organophosphorus acids,containing PCH<Subscript>2</Subscript>NP fragments

Reactions of [N-(trimethylsilyl)aminomethyl]phosphonates with organophosphorus acid chlorides was studied, which allowed to develop convenient synthetic approaches to novel phosphorus-substrituted dialkylamides of organophosphorus acids, including a PCH₂NP fragment. Certain properties of the resulting compounds are presented.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 9, 2004, pp. 1422–1425.Original Russian Text Copyright © 2004 by Prishchenko, Livantsov, Novikova, Livantsova, Koval, Grigorev.This revised version was published online in April 2005 with a corrected cover date.     

Enhancement of Kerr nonlinearity by multiphoton coherence

We propose a new method of resonant enhancement of optical Kerr nonlinearity that uses multilevel atomic coherence. The enhancement is accompanied by suppression of the other linear and nonlinear susceptibility terms of the medium. We show that the effect results in a modification of the nonlinear Faraday rotation of light propagating in an 87Rb vapor cell by changing the ellipticity of the light.     

Radiation trapping in coherent media

We show that the effective decay rate of Zeeman coherence, generated in a (87)Rb vapor by linearly polarized laser light, increases significantly with the atomic density. We explain this phenomenon as the result of radiation trapping. Our study shows that radiation trapping must be taken into account to fully understand many electromagnetically induced transparency experiments with optically thick media.     

Ac-Stark shifts in the nonlinear Faraday effect

The frequency of the dark resonance in coherent population trapping experiments has been measured as a function of the degree of ellipticity and the intensity of the probe light. The results have been used to find the quantum limit of sensitivity of an optical magnetometer based on the nonlinear Faraday effect.     

Surface Polaritons in GaAs/CdTe/PbTe Multilayer Structures

JETP Letters - Infrared spectra of reflection and attenuated total reflection of PbTe thin films deposited by molecular beam epitaxy on a GaAs/CdTe substrate have been measured. The high-frequency...     

Carbon 1s binding energy and substituent effects in C-centered radical cations

The carbon 1s binding energies (E _b) measured by X-ray photoelectron spectroscopy or obtained from quantum chemical calculations for 18 series of compounds in which the reaction center is the C atom are analyzed. It was established for the first time that E _b values in carboncentered radical cations depend on the inductive, resonance, and polarizability effects of substituents.     

Bismuth(III) complexing with some N- and N,N-substituted thioureas

Stability constants at ionic strength I = 2 and 293 K were determined spectrophotometrically for multiligand bismuth(III) complexes with thiourea (Tu), N-phenylthiourea (Ptu), N-phenyl-N′-propylthiourea (Pptu), N,N′-diphenylthiourea (Bptu), and N-allyl-N′-propylthiourea (Aptu). The protonation constants of these ligands in perchloric acid solutions were also determined. The stability of the listed complexes changes in the following order of ligands: aptu > tu > pptu > ptu > bptu. This order coincides with the order of changing protonation constants. Original Russian Text ? N.N. Golovnev, G.V. Novikova, and A.A. Leshok, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 2, pp. 374–376.