TY - JOUR
T1 - Anion effects on construction of ZnII compounds with a chelating ligand bis(2-pyridylmethyl)amine and their catalytic activities
AU - Kim, Youngmee
AU - Park, Byeong Kwon
AU - Eom, Geun Hee
AU - Kim, Soo Hyun
AU - Park, Hyun Min
AU - Choi, Young S.
AU - Jang, Ho G.
AU - Kim, Cheal
N1 - Funding Information:
Financial support from South Korea Ministry Environment “ET-Human Resource Development Project”, the Korean Science & Engineering Foundation ( R01-2008-000-20704-0 and 2009-0074066 ), the Converging Research Center Program through the National Research Foundation of South Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2009-0082832 ), and South Korea University Grant is gratefully acknowledged.
PY - 2011
Y1 - 2011
N2 - Three ZnII complexes containing bispicam ligands (bispicam = bis(2-pyridylmethyl)amine), [Zn(bispicam)2](NO3) 2·2CH3OH 4A, [Zn(bispicam)(NO3) 2] 4B, and [Zn(bispicam)2](OTf)2 6, were obtained, and their structures were determined by X-ray crystallography. Complexes of the general formulation [Zn(bispicam)2]X2 (X = Cl- (1), Br- (2), I- (3), NO3 - (4A), ClO4- (5), and OTf- (6)) show fac geometric isomers (a) or enantiomers (c) and (d) according to anions. Moreover, complexes 4-6 could carry out the catalytic transesterification of a range of esters with methanol under the mild conditions. Importantly, the catalyst 4B with an unsaturated structure has shown better efficiency than the catalysts, 4A, 5, and 6, having saturated structures. To explain this reactivity difference, two different reaction mechanisms have been proposed (metal-based vs. amide N-H-based).
AB - Three ZnII complexes containing bispicam ligands (bispicam = bis(2-pyridylmethyl)amine), [Zn(bispicam)2](NO3) 2·2CH3OH 4A, [Zn(bispicam)(NO3) 2] 4B, and [Zn(bispicam)2](OTf)2 6, were obtained, and their structures were determined by X-ray crystallography. Complexes of the general formulation [Zn(bispicam)2]X2 (X = Cl- (1), Br- (2), I- (3), NO3 - (4A), ClO4- (5), and OTf- (6)) show fac geometric isomers (a) or enantiomers (c) and (d) according to anions. Moreover, complexes 4-6 could carry out the catalytic transesterification of a range of esters with methanol under the mild conditions. Importantly, the catalyst 4B with an unsaturated structure has shown better efficiency than the catalysts, 4A, 5, and 6, having saturated structures. To explain this reactivity difference, two different reaction mechanisms have been proposed (metal-based vs. amide N-H-based).
KW - Bis(2-pyridylmethyl)amine
KW - Catalyst
KW - Geometric isomers
KW - Transesterification
KW - Zinc(II) complexes
UR - http://www.scopus.com/inward/record.url?scp=79251596466&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2010.11.029
DO - 10.1016/j.ica.2010.11.029
M3 - Article
AN - SCOPUS:79251596466
SN - 0020-1693
VL - 366
SP - 337
EP - 343
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1
ER -