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Crystal Structure and Ethylene Oligomerization Catalytic Activity of {2‐Carbethoxy‐6‐[1‐[(2,6‐diethyl‐phenyl)imino]ethyl]pyridine}CoCl 2
Author(s) -
Sun BiYun,
Zhao JianShe,
Gao QuanChang
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790005
Subject(s) - chemistry , pyridine , ethylene , trigonal bipyramidal molecular geometry , cobalt , ligand (biochemistry) , catalysis , crystal structure , medicinal chemistry , crystallography , polymer chemistry , stereochemistry , inorganic chemistry , organic chemistry , receptor , biochemistry
The unsymmetric precursor ethyl 6‐acetylpyridine‐2‐carboxylate ( 4 ) was synthesized from 2,6‐dimethylpyridine ( 1 ). On the basis of this precursor, a new mono(imino)pyridine ligand ( 5 ) and the corresponding Co(II) complex {2‐carbethoxy‐6‐[1‐[(2,6‐diethylphenyl)imino]ethyl]pyridine}CoCl 2 ( 6 ) were prepared. The crystal structure of complex indicates that the 2‐carbethoxy‐6‐iminopyridine is coordinated to the cobalt as a tridentate ligand using [N, N, O] atoms, and the coordination geometry of the central cobalt is a distorted trigonal bipyramid, with the pyridyl nitrogen atom and the two chlorine atoms forming the equatorial plane. Being applied to the ethylene oligomerization, this cobalt complex shows catalytic activity of 1.820×10 4 g/mol‐Co·h at 101325 Pa of ethylene at 15.5 °C for 1 h, when 1000 equiv. of methylaluminoxane (MAO) is employed as the cocatalyst.