Remarkably Strong, Uncharged Hydrogen-Bonding Interactions of Polypyridine-Macrocyclic Receptors for Deoxyribofuranosides
摘要:
Novel macrocyclic saccharide receptors that possess a pyridine-pyridone-pyridine arrangement as a hydrogen-bonding motif are presented. The artificial receptors exhibited a remarkably strong binding affinity for deoxyribofuranoside derivatives in CDCl3 (K-a = 19 000 M-1 -Delta G(298) = 24.4 kJ/mol), one of the highest values of artificial receptors having only uncharged hydrogen-bonding sites for monosaccharide derivatives. Selective extraction of deoxyribose by the receptors was also observed; the extractabilities,;or affinities to the receptors of various pentoses and hexoses, decreased in the following order: deoxyribose > lyxose congruent to ribose > arabinose congruent to fructose congruent to xylose > glucose > mannose > galactose.
Remarkably Strong, Uncharged Hydrogen-Bonding Interactions of Polypyridine-Macrocyclic Receptors for Deoxyribofuranosides
摘要:
Novel macrocyclic saccharide receptors that possess a pyridine-pyridone-pyridine arrangement as a hydrogen-bonding motif are presented. The artificial receptors exhibited a remarkably strong binding affinity for deoxyribofuranoside derivatives in CDCl3 (K-a = 19 000 M-1 -Delta G(298) = 24.4 kJ/mol), one of the highest values of artificial receptors having only uncharged hydrogen-bonding sites for monosaccharide derivatives. Selective extraction of deoxyribose by the receptors was also observed; the extractabilities,;or affinities to the receptors of various pentoses and hexoses, decreased in the following order: deoxyribose > lyxose congruent to ribose > arabinose congruent to fructose congruent to xylose > glucose > mannose > galactose.
Optical parts and sulfur-containing poly (thio)ester (co)polymer
申请人:——
公开号:US20030204030A1
公开(公告)日:2003-10-30
A poly(thio)ester (co)polymer which comprises a repeating structural unit represented by the formula (1-A) as an essential structural unit:
1
[wherein R
11
is a divalent aliphatic hydrocarbon group which may contain at least one sulfur atom in a sulfide group; R
12
is a mono- or poly-cyclic aliphatic or aromatic dicarboxylic acid residue; and X
11
and X
12
are each independently an oxygen atom or sulfur atom, and when X
11
and X
12
are the oxygen atoms, R
11
is a divalent aliphatic hydrocarbon group containing at least one sulfur atom in the sulfide group]; and an optical component obtainable by molding the poly(thio)ester (co)polymer. The poly(thio)ester (co)polymer is excellent in transparency and optical characteristics (e.g., a higher refractive index, higher Abbe number, and lower birefringence), and has also good mechanical characteristics and thermal characteristics, and further is excellent in melt fluidity and injection moldability.
Thermoplastische aromatische Copolycarbonate, Verfahren zu deren Herstellung aus 2,2-Bis-(4-hydroxyphenyl)-1,1,1,3,3,3,-hexafluorpropan und deren Verwendung
申请人:Mobay Chemical Corporation
公开号:EP0029111A1
公开(公告)日:1981-05-27
Gegenstand der vorliegenden Erfindung sind neue thermoplastische aromatische Copolycarbonate aus 2,2-Bis-(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluorpropan, ihre Herstellung und ihre Verwendung zur Herstellung von Formkörpern und Folien.
Optical component and spirobiindan polymer therefor
申请人:MITSUI TOATSU CHEMICALS, INCORPORATED
公开号:EP0822545A2
公开(公告)日:1998-02-04
There is provided a low-birefringent organic optical component comprising a polymer prepared by polymerizing a racemic mixture of the monomer with an asymmetric spiro ring represented by general formula (1) as an essential ingredient;
wherein ring A represents a monocyclic or polycyclic organic group, wherein two ring As are mutually bound each other via a spiro bond to form a spiro ring which has a molecular asymmetric structure; n is an integer of 0 to 10; X1 and Y1 are binding groups; Z1 is a polymerization-active group.
The component has excellent transparency, mechanical strength and heat resistance, as well as a low birefringence.
本发明提供了一种低双折射有机光学元件,其包含一种聚合物,该聚合物是通过聚合以通式(1)为代表的不对称螺环为基本成分的单体外消旋混合物而制备的;
其中,环 A 代表单环或多环有机基团,两个环 As 通过螺键相互结合形成具有分子不对称结构的螺环;n 为 0 至 10 的整数;X1 和 Y1 为结合基团;Z1 为聚合活性基团。
该成分具有出色的透明度、机械强度和耐热性,以及较低的双折射。
A polycarbonate copolymer and applications thereof
申请人:MITSUI CHEMICALS, INC.
公开号:EP0926180A2
公开(公告)日:1999-06-30
A polycarbonate copolymer comprising the repeating structural unit represented by general formula (1-a) and at least one of the repeating structural units represented by general formulas (2-a) and (3-a) is provided.
It may be used for optical components.
The present invention provides a dyed molded article obtained by dyeing a polycarbonate molded article having repeating structural units represented by the following formula (1-a):
Since the polycarbonate molded article is dyed easily, the present invention has made it possible to provide a lens made of a dyed polycarbonate.