Lg Chem, Ltd

Seoul National University

Young Keun Chung

Dai Seung Choi

Sung Cheol Yoon

Sung Ho Chun

Young Whan Park

Jungmin Lee

Il Gu Jung

TaeSun Lim

Dong Hoon Lee

Jong-In Hong

Seung Uk Son

Ja Hyun Im

Provided is a method of preparing a cyclic olefin polymer by addition polymerization of a cyclic olefin monomer, the method including contacting a metal catalyst complex represented by Formula 1 below with a cyclic olefin monomer represented by Formula 2 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; wherein M is a Group X metal; [M(L)(L&#x2032;)(L)] is a cationic complex; Lis an anionic hydrocarbyl-containing ligand; L&#x2032;is a neutral ligand; Lis an N-heterocyclic carbene ligand; [Ani] is an anion capable of weakly coordinating with the metal M; x is 1 or 2; y is 0 to 4; z is 1 or 2; 2&#x2266;x+y+z&#x2266;6; a and b are respectively the number of cations and the number of anions capable of weakly coordinating with the metal M and are each a number of 1-10 which is used to satisfy the net charge balance of the metal catalyst complex, and wherein for each of L, L&#x2032;, and L, when a plurality of ligands are present in a molecule of the metal catalyst complex, the ligands may be the same or different, and  wherein m is an integer of 0 to 4; and R, R&#x2032;, R&#x2033;, and R&#x2033;&#x2032;are each independently a polar functional group or a nonpolar functional group. According to the method of the present invention, a high molecular weight cyclic olefin addition polymer can be produced in a high yield even when using a polar functional group-containing cyclic olefin monomer. A polymer produced using the method shows good thermal stability.

Polymerization methods using the catalysts

Provided is a metal catalyst complex for preparing a cyclic olefin-based polymer by addition polymerization of a cyclic olefin-based monomer, which is represented by Formula 1 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; The metal catalyst complex has an N-heterocyclic carbene ligand, and thus, is excellent in thermal stability and reactivity.

Catalysts for polymerizing cyclic olefin

A novel coordination complex formed by dinuclear metal complexation is provided. The complex is a dinuclear metal complex of a compound, wherein the compound comprises a conjugation ring system substituted with: a) an electron donating group selected from &#x2014;OH, &#x2014;SH and &#x2014;NH; b) an indicating group selected from a chromogenic group, a fluorescent group and an electrochemical group; and c) two binding auxiliary groups, in combination with the electron donating group each of which being coordinated with the metal to provide an anion bonding site, wherein as the complex binds to a anion, the coordination of the electron donating group with the metal is weakened and electron donation of the electron donating group to the conjugation ring system is reinforced such that the reinforced electron donation by the electron donating group is transferred through the conjugation ring system to the indicating group to produce an indicating signal concomitant with the change of its electronic density. The coordination complex shows high sensitivity and high selectivity for pyrophosphate over other anions in an aqueous solvent over a wide pH range. Therefore, the complex is useful for pyrophosphate assay as a pyrophosphate sensor.

Dinuclear metal complex and pyrophosphate assay using the same

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Seoul, South Korea

Young Keun Chung