Journal of Physical Chemistry p. 4002 - 4007 (1985)
Update date:2022-08-03
Smith, Morgan L.
McHale, Jeanne L.
The electron donor-acceptor (EDA) complexes of hexamethylbenzene (HMB) and tetracyanoethylene (TCNE) have been studied by optical and resonance Raman spectroscopy in a variety of solvents.The visible absorption spectra of the 1:1 and 2:1 complexes in cyclohexane have been resolved by multiwavelength linear regression of concentration-dependent absorbance data. the resonance Raman spectra of CCl4, CH2Cl2, and cyclohexane solutions of HMB and TCNE have been obtained with 5145-Angstroem excitation.A low-frequency mode at 163-169 cm-1 is assigned to the first overtone of the donor-acceptor stretch, νDA.In cyclohexane, the second overtone of νDA is also observed, but is overlapped by an a2u out-of-plane bending vibration of the methyl groups of HMB, which becomes allowed in the 2:1 complex due to vibronic coupling.A simple molecular orbital picture of the bonding in the 1:1 and 2:1 complexes is proposed which explains the resolved visible spectra as well as the low-frequency Raman data.It is concluded that the second donor molecule is not bound by "charge-transfer" forces, and that, although the ground state 2:1 complex has D2h symmerty, the two D-A bonds are of unequal strngth.
View MoreTAIXING BEST NEW MATERIALS CO., LTD
Contact:0523-87998158;
Address:No.18 Zhonggang Road,Taixing City ,Jiangsu , China
SINO Industries Company Limited(expird)
Contact:86-29-85369724
Address:No.111, Jiefang Road, Xi’an, China
Shanghai Sunway Pharmaceutical Technology Co.,Ltd.
Contact:+86-21-5161 3915
Address:Shanghai YangPu
Hebei Tianxiang Biological & Pharmaceutical Co., Ltd
Contact:86-0312-6615158
Address:No 42 fazhan street qingyuan county
Hangzhou Ledun Technology Co.,Ltd.
Contact:86-571-18767088918
Address:No.6 street,XiaSha,Hangzhou,China.
Doi:10.1016/j.bmcl.2020.127070
(2020)Doi:10.1021/ja9643228
(1997)Doi:10.1016/0223-5234(96)83970-5
(1996)Doi:10.1002/chem.201303860
(2014)Doi:10.1021/tx00044a003
(1995)Doi:10.1016/S0040-4039(00)78448-6
(1994)