Umadevi M, Vanelle P, Terme T, Ramakrishnan V
Department of Physics, Mother Teresa Women's University, Kodaikanal, 624102 Tamil Nadu, India.
J Fluoresc. 2006 Jul;16(4):569-79. doi: 10.1007/s10895-006-0093-9. Epub 2006 Jun 15.
Solvent effects on 2,3-bis(chloromethyl)-1,4-anthraquinone (DCMAQ) and the molecular recognition of DCMAQ in calix[8]arene were investigated using optical absorption and fluorescence emission techniques. Optical absorption spectra show n-->pi(*) band in 350-500 nm region. It also indicates that the dipole-dipole interaction and solvent reorganization energies are responsible for the observed features in different solvents. The observed quantum yield of DCMAQ in different solvents is due to the formation of intermolecular hydrogen bond and reorientation of solvent molecule in the excited state of DCMAQ. Excited state dipole moment of DCMAQ is calculated by solvatochromic data and it shows a higher excited state dipole moment than ground state dipole moment. Optical absorption and fluorescence studies of DCMAQ in calix[8]arene elucidate the evidence for the formation of complex between DCMAQ and calix[8]arene. The inclusion ratios and inclusion constant of the host-guest complexes are also determined.
采用光吸收和荧光发射技术研究了溶剂对2,3-双(氯甲基)-1,4-蒽醌(DCMAQ)的影响以及DCMAQ在杯[8]芳烃中的分子识别。光吸收光谱在350 - 500 nm区域显示n→π(*)带。这也表明偶极-偶极相互作用和溶剂重组能是导致在不同溶剂中观察到的特征的原因。DCMAQ在不同溶剂中观察到的量子产率是由于分子间氢键的形成以及溶剂分子在DCMAQ激发态下的重新取向。通过溶剂化显色数据计算了DCMAQ的激发态偶极矩，结果表明其激发态偶极矩高于基态偶极矩。对DCMAQ在杯[8]芳烃中的光吸收和荧光研究阐明了DCMAQ与杯[8]芳烃之间形成络合物的证据。还测定了主客体络合物的包合比和包合常数。
