Approved by the Ministry of Education of the People's Republic of China in 2003, Chifeng University was founded as a public, full-time and comprehensive undergraduate university by the combination of the Chifeng Normal College of Nationalities and other four academies. It is located in the city of Chifeng, the birthplace of the Hong Shan Cultures. The city has scenic spots and is a tourist destination. The university has 24 colleges or departments Wikipedia.
Jin R.F.,Chifeng University |
Chang Y.F.,Northeast Normal University
Physical Chemistry Chemical Physics | Year: 2015
A series of D-π-A star-shaped molecules with triphenylamine (TPA) as a core, 1,8-naphthalimide (NI) derivatives as end groups, and different p-bridges have been designed to explore their optical, electronic, and charge transport properties as organic solar cell (OSC) materials. The calculation results showed that the star-shaped molecules can lower the material band gap and extend the absorption spectrum towards longer wavelengths. The designed molecules own the longest wavelength of absorption spectra, oscillator strength, and absorption region values. Our results suggest that the designed molecules are expected to be promising candidates for OSC materials. Additionally, the molecules with ethyne, thiophene, benzo[c][1,2,5]thiadiazole (BTA), and 2,3-dihydrothieno[3,4-b][1,4]dioxine (DTD) as π-bridges and 4-pyridne, 4-aniline, and H in NI fragments have better hole- and electron transporting balance and can act as nice ambipolar materials. The values of hole mobility of molecules with ethyne as a π-bridge and NI as an end group for Pna21 and P21/c are 5.30 × 10-3 and 1.27 × 10-2 cm2 V-1 s-1, respectively. On the basis of the investigated results, we suggest that molecules under investigation are suitable donors of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and its derivatives are acceptors of solar cells. © the Owner Societies 2015.
Zhu H.,Chifeng University
World Transactions on Engineering and Technology Education | Year: 2015
This article briefly describes the present situation with on-line higher education teaching in the information age. The author analyses the characteristics of the MOOC and SPOC, proposes and constructs a new model of on-line education in the post-MOOC period; namely, the teaching mode of SPOC based on - self-directed learning - collaborative learning - hybrid learning (S+C+H). Taking the teaching practice of an engineering graphics course as an example, the article displays the personalised self-directed learning mode with resource sharing, the collaborative learning mode with simultaneous joint teaching in different places and the hybrid learning model with flipped classes. The scope of the new model is that it will gradually break the traditional pattern of cramming education. © 2015 WIETE.
Jin R.,Chifeng University
Journal of molecular modeling | Year: 2014
The interactions between chemosensors, donor-π-acceptor (D-π-A) dipolar organoboron derivatives, and different (CN-, F-, Cl-, and Br-) anions have been theoretically investigated using DFT approaches. Theoretical investigations have been performed to explore the optical, electronic, charge transport, and stability properties of organoboron derivatives as charge transport and luminescent materials for organic light emitting devices (OLEDs). It turned out that the unique selectivity of organoboron derivatives for F-/CN- is ascribed to the formation of chemosensors complexes. The frontier molecular orbitals (FMOs) and local density of states analysis have turned out that the vertical electronic transitions of absorption and emission for chemosensors and their F-/CN- complexes are characterized as intramolecular charge transfer (ICT). The formation of complexes has effect on the distribution of FMOs and the flowing direction of electronic density for vertical transition. The study of substituent effects suggests that the derivatives with thiophene (2), furan (3), and 1H-pyrrole (4) fragments, are expected to be promising candidates for ratiometric fluorescent fluoride and cyanide chemosensors as well as chromogenic chemosensors, whereas derivatives with pyridine (5) and pyrimidine (6) fragments can serve as chromogenic chemosensors only. Furthermore, all the derivatives are promising luminescent and hole transport materials and 2, 3, 5, and 6 can serve as electron transport materials for OLEDs.
Jin R.,Chifeng University
Journal of Fluorine Chemistry | Year: 2014
The interactions between chemosensors, organosilicon 1,8-naphthalimide derivatives, and different (F-, Cl-, Br-, and AcO-) anions have been theoretically investigated using Density functional theory (DFT) approaches. Theoretical investigations have been performed to explore the optical and electronic properties of the colorimetric fluoride anion chemosensors. It turned out that the unique selectivity of chemosensors for F- is ascribed to their ability of the cleavage of OSi bond of the host sensors. The frontier molecular orbitals (FMOs) analyses have turned out that the vertical electronic transitions of chemosensors and their anions are characterized as intramolecular charge transfer (ICT). The study of substituent effects suggests that the substituted derivatives with nitrobenzene (1), anisole (2), benzo[c][1,2,5]thiadiazole (3), benzo[c]thiophene (4), and 2-phenylthiophene (5) fragments are expected to be promising candidates for colorimetric fluoride anion chemosensors. © 2014 Elsevier B.V.
Jin R.,Chifeng University
Journal of Fluorine Chemistry | Year: 2011
The interactions between chemosensor, 2-(2′-hydroxyphenyl)-4- phenylthiazole (1), and different halides (F-, Cl-, and Br-) and NO3- anions have been theoretically investigated at the B3LYP/6-31G(d) level with the BSSE correction. It turned out that the unique selectivity of 1 for F- is ascribed to its ability of deprotonating the hydroxy group of host sensor. The intermolecular proton transfer (IPT) causes the colorimetric and fluorescent signaling of 1 for F -. The deprotonated complex 1-·HF is formed for the deprotonation process of chemosensor. The study of substituent effects suggest that the electron-donating -CH3 and -OCH3 substituted derivatives are expected to be promising candidates for ratiometric fluorescent F- chemosensors as well as chromogenic chemosensors, while electron-donating -N(CH3)2 substituted derivative can serve as chromogenic F- chemosensors only. Furthermore, the electron-withdrawing (-NO2 and -Br) substituted derivatives can serve as chromogenic F-/CH3COO- chemosensors. © 2011 Published by Elsevier B.V. All rights reserved.