TY - JOUR
T1 - Efficient and tunable phosphorescence of new platinum(II) complexes based on the donor-π-acceptor Schiff bases
AU - Zhang, Jie
AU - Dai, Guoliang
AU - Wu, Fengshou
AU - Li, Dan
AU - Gao, Dongchun
AU - Jin, Haiwei
AU - Chen, Song
AU - ZHU, Xunjin
AU - Huang, Chenxiu
AU - Han, Deman
N1 - Funding Information:
This work was supported by the Zhejiang Provincial Natural Science Foundation of China (No. LQ13B010001 ), National Natural Science Foundation of China (No. 21501128 , 21575097 , 21375092 , 21203135 ), China Postdoctoral Science Foundation (No. 2014M560476 ) and Key Disciplines of Applied Chemistry of Zhejiang Province, Taizhou University . We also thank the Project of Science and Technology Innovation for College Students in Zhejiang Province (No. 2014R428016 ), Natural Science Fund for Colleges and Universities in Jiangsu Province (No. 14KJB150024 ) and Scientific Research Founding of Wuhan Institute of Technology (No. K201542 ) for financial support. X. Zhu thanks the financial support from Hong Kong Baptist University ( FRG2/14-15/034 and FRG1/14-15/058 ).
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 2,3-diaminomaleonitrile and benzene-1,2-diamine, respectively, afforded two donor-π-acceptor Schiff base ligands H2L1 and H2L2. For comparison, the condensation of 3,5-di-tert-butyl-2-hydroxybenzaldehyde with 4-(trifluoromethyl)benzene-1,2-diamine produced the ligand H2L3. Subsequently, their corresponding platinum(II) complexes PtL1, PtL2 and PtL3 were prepared through the metallation of ligands with K2PtCl4. All the ligands and complexes were characterized by 1H NMR, infrared spectroscopy and mass spectrometry. And their thermal stabilities, photophysical properties, and electrochemical behaviors were investigated in detail. These complexes show yellow to red emissions with the highest quantum yield of 8.6% for PtL1. The decay times in microsecond scale (1.97-2.35 μs) indicate their phosphorescence characteristics arising from the triplet state. The B3LYP density functional theory calculations shows that the HOMO-LUMO gaps of PtL1, PtL2 and PtL3 are 2.53, 3.07 and 2.78 eV, respectively, which are well consistent with their photophysical properties. With the advantages of preparative accessibility and high thermal stability, these new phosphorescent platinum(II) complexes are attractive as emissive layer in organic light-emitting diodes.
AB - The condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 2,3-diaminomaleonitrile and benzene-1,2-diamine, respectively, afforded two donor-π-acceptor Schiff base ligands H2L1 and H2L2. For comparison, the condensation of 3,5-di-tert-butyl-2-hydroxybenzaldehyde with 4-(trifluoromethyl)benzene-1,2-diamine produced the ligand H2L3. Subsequently, their corresponding platinum(II) complexes PtL1, PtL2 and PtL3 were prepared through the metallation of ligands with K2PtCl4. All the ligands and complexes were characterized by 1H NMR, infrared spectroscopy and mass spectrometry. And their thermal stabilities, photophysical properties, and electrochemical behaviors were investigated in detail. These complexes show yellow to red emissions with the highest quantum yield of 8.6% for PtL1. The decay times in microsecond scale (1.97-2.35 μs) indicate their phosphorescence characteristics arising from the triplet state. The B3LYP density functional theory calculations shows that the HOMO-LUMO gaps of PtL1, PtL2 and PtL3 are 2.53, 3.07 and 2.78 eV, respectively, which are well consistent with their photophysical properties. With the advantages of preparative accessibility and high thermal stability, these new phosphorescent platinum(II) complexes are attractive as emissive layer in organic light-emitting diodes.
KW - Donor-π-acceptor
KW - Phosphorescence
KW - Platinum(II) complexes
KW - Schiff bases
KW - Tunable emissions
UR - http://www.scopus.com/inward/record.url?scp=84944738444&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2015.09.018
DO - 10.1016/j.jphotochem.2015.09.018
M3 - Journal article
AN - SCOPUS:84944738444
SN - 1010-6030
VL - 316
SP - 12
EP - 18
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
ER -