TY - JOUR
T1 - Synthesis, structural features, and methyl methacrylate polymerisation of binuclear zinc(II) complexes with tetradentate pyrazolyl ligands
AU - Kim, Sunghoon
AU - Kim, Dongil
AU - Lee, Ha Jin
AU - Lee, Hyosun
PY - 2014/4/24
Y1 - 2014/4/24
N2 - The reaction of ZnCl2 with ancillary ligands, including 1,4-bis-(N,N-di-(1H-pyrazolyl-1-methyl)amine)benzene (L1) and 4,4′-bis-(N,N-di(1H-pyrazolyl-1-methyl)phenyl)methane (L2), in ethanol yields Zn(II) chloride complexes, i.e., 1,4-bis-(N,N-di-(1H-pyrazolyl-1- methyl)amine)benzene(dichloro)Zn(II) [L1Zn2Cl4] and 4,4′-bis-(N,N-di-(1H-pyrazolyl-1-methyl)phenyl)methane(dichloro) Zn(II) [L2Zn2Cl4]. The X-ray crystal structures of Zn(II) complexes revealed that they are binuclear, and each zinc atom has a distorted tetrahedral geometry which involves a nitrogen atom from two pyrazole groups and two chloro ligands. The catalytic activity of [L1Zn 2Cl4] and [L2Zn2Cl4] for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) increased by twofold compared to the corresponding monomeric Zn(II) complex, N,N-bis(1H-pyrazolyl-1-methyl)aniline(dichloro)Zn(II) [LZnCl2], at 60 C.
AB - The reaction of ZnCl2 with ancillary ligands, including 1,4-bis-(N,N-di-(1H-pyrazolyl-1-methyl)amine)benzene (L1) and 4,4′-bis-(N,N-di(1H-pyrazolyl-1-methyl)phenyl)methane (L2), in ethanol yields Zn(II) chloride complexes, i.e., 1,4-bis-(N,N-di-(1H-pyrazolyl-1- methyl)amine)benzene(dichloro)Zn(II) [L1Zn2Cl4] and 4,4′-bis-(N,N-di-(1H-pyrazolyl-1-methyl)phenyl)methane(dichloro) Zn(II) [L2Zn2Cl4]. The X-ray crystal structures of Zn(II) complexes revealed that they are binuclear, and each zinc atom has a distorted tetrahedral geometry which involves a nitrogen atom from two pyrazole groups and two chloro ligands. The catalytic activity of [L1Zn 2Cl4] and [L2Zn2Cl4] for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) increased by twofold compared to the corresponding monomeric Zn(II) complex, N,N-bis(1H-pyrazolyl-1-methyl)aniline(dichloro)Zn(II) [LZnCl2], at 60 C.
KW - 1,4-Bis-(N,N-di-(1H-pyrazolyl-1-methyl)amine)benzene
KW - 4,4′-Bis-(N,N- di(1H-pyrazolyl-1-methyl)phenyl)methane
KW - Binuclear zinc(II) complex
KW - MMA polymerization
UR - http://www.scopus.com/inward/record.url?scp=84893915511&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2014.01.038
DO - 10.1016/j.molstruc.2014.01.038
M3 - Article
AN - SCOPUS:84893915511
SN - 0022-2860
VL - 1063
SP - 70
EP - 76
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1
ER -