Abstract The molecular complexes of novel water soluble 1,4-benzoquinones possessing different alkoxy substituents, with cimetidine drug have been investigated using various spectral techniques such as UV–Vis, 1 H NMR, FT-IR. The stoichiometry of the CT complexes was found to be 1:1, in all the cases. The Density Functional Theory calculations supported the experimental observations. Correlation of
摘要 具有不同烷氧基取代基的新型水溶性 1,4-苯醌与西咪替丁药物的分子复合物已使用各种光谱技术进行了研究,例如 UV-Vis、1 H NMR、FT-IR。在所有情况下,发现 CT 复合物的化学计量比为 1:1。密度泛函理论计算支持实验观察。CT 配合物的形成常数 ( K ) 与 Taft 的极性 ( σ ⁎ ) 和空间 ( E s ) 常数的相关性表明,烷氧基的电子释放特性的增加使这些受体越来越弱,而取代基降低了形成常数。
Benzoquinone compounds
申请人:Imperial Chemical Industries PLC
公开号:US05283355A1
公开(公告)日:1994-02-01
Compounds of the Formula (5) and processes for their preparation and use, particularly in the manufacture of unsymmetrical triphenodioxazine dyes: ##STR1## wherein: Y is H, alkyl, substituted alkyl, alkoxy, Cl or Br; R is a group of Formula (3) ##STR2## R.sup.1 and R.sup.2 are each independently alkyl, or R.sup.1 and R.sup.2 together with the carbon atom to which they are attached form an optionally substituted 4, 5 or 6 membered alicyclic or heterocyclic ring; R.sup.3 is H; Z is Cl, Br or A--NH; and A is H or the residue of a primary amine.
Spectral and theoretical studies on the molecular complexes of azacyclonol with new π-acceptors, alkoxysubstituted 1,4-benzoquinones
作者:C. Balraj、A. Satheshkumar、K. Ganesh、Kuppanagounder P. Elango
DOI:10.1016/j.molstruc.2012.09.033
日期:2013.3
The molecular complexes of a series of new electron acceptors, 1,4-benzoquinones possessing variety of alkoxy substituents, with azacyclonol have been investigated using various spectral techniques such as UV-Vis, H-1 NMR, FT-IR, fluorescence and LC-MS. The stoichiometry of the complexes was determined by Job's continuous variation method and was found to be 1:1, in all the cases. The results of equilibrium, and kinetic studies were well supported by ab initio DFT calculations. Correlation of formation constants of the complexes with Taft's polar and steric constants indicated that both these factors play significant role in governing the reactivity. Also, the results indicated that an increase in electron releasing property of the alkoxy group makes these acceptors increasingly weaker while an increase in steric property of the substituent decreased the formation constant. (c) 2012 Elsevier B.V. All rights reserved.