A series of d-glucose-bound optically active π-conjugated polymers (poly-T_r) were synthesized by ternary copolymerization of 2,5-diiodothiophene with diethynyl monomers containing a chiral and an achiral biphenyl unit using the Sonogashira coupling reaction. The effect of the chiral and achiral biphenyl contents on the chiral amplification in the preferred-handed helix formation (“the sergeants and soldiers effect”) was investigated by comparing the circular dichroism (CD) and circularly polarized luminescence (CPL) intensities of poly-T_r to that of the corresponding helical polymer (poly-T) without an achiral biphenyl unit. We observed that even when the chiral biphenyl content in the copolymer was 50 mol % (poly-T_0.50), its CD and CPL intensities were almost comparable to that of poly-T, demonstrating the amplification of the helicity.

中文翻译：

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圆偏振发光的π共轭螺旋聚合物的手性放大

使用Sonogashira偶联反应，通过2,5-二碘噻吩与含有手性和非手性联苯单元的二乙炔基单体的三元共聚反应，合成了一系列d-葡萄糖键合的光学活性π共轭聚合物（poly- _Tr）。通过比较聚异戊二烯的圆二色性（CD）和圆偏振发光（CPL）的强度，研究了手性和非手性联苯含量对首选螺旋结构中手性扩增的影响（“中士和士兵效应”）。 T _r为不具有非手性联苯单元的相应螺旋聚合物（poly-T）的T _r。我们观察到，即使共聚物中的手性联苯含量为50 mol％（poly-T _0.50），其CD和CPL强度几乎与poly-T相当，表明螺旋度得到了增强。