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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Theoretical and UV spectral study of isomeric 1-(quinolinyl)-beta-carbolines conformations
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Theoretical and UV spectral study of isomeric 1-(quinolinyl)-beta-carbolines conformations

机译:1-(喹啉基)-β-咔啉异构体构型的理论和紫外光谱研究

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摘要

On the basis of beta-carboline (1) and 1-(quinolin-2 '-yl)-beta-carboline (3) alpha-and t-band energies differences (Delta(alpha,t)) a equilibrium conformations of 1-(quinolin-4 '(5 '-8 ')-yl)-beta-carbolines (4-8) in solution have been estimated. Furthermore, as an example of model compounds 1-(alpha '-naphtyl)-beta-carboline (MC1) and 1-(beta '-naphtyl)-beta-carboline (MC2) and also 5 and 6 by molecular mechanics (mm+), semi-empirical (AM1) and none empirical (RHF/6-31G(d)) methods a computations of internal rotation of quinoline fragment around single bond have been performed. It was found that the greater bathochromic shift of the long-wavelength band maxima of 1, in the case of 3 (Delta lambda(max) = 39 nm) relatively to 6, 7 (Delta lambda(max) = 17 +/- 2 nm) and 4, 5, 8 (Delta lambda(max) = 9 +/- 1 nm) caused by coplanarity of the molecule 3. Also, from experimental and theoretical investigations a less dihedral angle between beta-carboline and quinoline nucleons for 6, and 7 than 4, 5 and 8 owing to steric and electronic interactions have been found. (c) 2006 Elsevier B.V. All rights reserved.
机译:基于β-咔啉(1)和1-(喹啉2'-基)-β-咔啉(3)的α和t波段能量差(Delta(alpha,t))的均衡构型为1-已经估计了溶液中的(喹啉-4'(5'-8')-基)-β-咔啉(4-8)。此外,作为模型化合物的实例,1-(α'-萘基)-β-咔啉(MC1)和1-(β'-萘基)-β-咔啉(MC2),以及通过分子力学(mm +)的5和6 ,半经验(AM1)和无经验(RHF / 6-31G(d))方法,已计算出喹啉片段围绕单键的内部旋转。发现在3(Delta lambda(max)= 39 nm)的情况下,相对于6,7(Delta lambda(max)= 17 +/- 2),长波带最大值1的更大的红移。 nm)和4、5、8(Δlambda(max)= 9 +/- 1 nm)是由于分子3的共面性造成的。此外,根据实验和理论研究,β-咔啉和喹啉核子之间的二面角较小,对于6 ,由于空间和电子相互作用,发现了7比4、5和8。 (c)2006 Elsevier B.V.保留所有权利。

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