ICCAS OpenIR
Chromium(III) complexes bearing 2-benzazole-1,10-phenanthrolines: synthesis, molecular structures and ethylene oligomerization and polymerization
Zhang, Min1,2; Wang, Kefeng1,2; Sun, Wen-Hua1,2,3
2009
Source PublicationDALTON TRANSACTIONS
ISSN1477-9226
Issue32Pages:6354-6363
AbstractThe 2-benzazole-1,10-phenanthrolines and their chromium(III) complexes were synthesized and characterized by elemental and spectroscopic analyses as well as by single-crystal X-ray crystallography. X-Ray crystallographic analyses of C6 and C8 reveal an octahedral geometry around both chromium centers. The electronic spectra of the chromium complexes exhibit d-d transitions typically of a pseudo-octahedral coordinated d(3) ion, falling into the region nu(1) (4)A(2g) -> (4)T(2g) 600-700 nm, nu(2) (4)A(2g) -> (4)T(1g)(F) 430-470 nm, and the 10Dq values between 15674 and 16529 cm(-1). The variation of the heteroatoms (X = N, O, S) in benzazole group shows regular influence on the 10Dq values as 10Dq (O) > 10Dq (N) > 10Dq (S), which reflects the sigma-donor/pi-acceptor properties of these benzazole ligands. Upon activation with modified methylaluminoxane (MMAO), these complexes exhibited high activities for ethylene oligomerization (up to 7.36 x 10(6) g mol(-1) (Cr) h(-1)) and ethylene polymerization (up to 1.28 x 10(6) g mol(-1) (Cr) h(-1)). The effects of non-coordinated N, O or S heteroatoms in the ligands have been examined, and interestingly catalytic activities also strictly adhered to the trend O > N > S under various ethylene pressures. Reaction conditions significantly influenced the catalytic properties of the complexes.
DOI10.1039/b902361e
Indexed BySCI
Language英语
WOS IDWOS:000268689000015
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66816
Collection中国科学院化学研究所
Corresponding AuthorSun, Wen-Hua
Affiliation1.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Min,Wang, Kefeng,Sun, Wen-Hua. Chromium(III) complexes bearing 2-benzazole-1,10-phenanthrolines: synthesis, molecular structures and ethylene oligomerization and polymerization[J]. DALTON TRANSACTIONS,2009(32):6354-6363.
APA Zhang, Min,Wang, Kefeng,&Sun, Wen-Hua.(2009).Chromium(III) complexes bearing 2-benzazole-1,10-phenanthrolines: synthesis, molecular structures and ethylene oligomerization and polymerization.DALTON TRANSACTIONS(32),6354-6363.
MLA Zhang, Min,et al."Chromium(III) complexes bearing 2-benzazole-1,10-phenanthrolines: synthesis, molecular structures and ethylene oligomerization and polymerization".DALTON TRANSACTIONS .32(2009):6354-6363.
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