Matsuki Ryo, Asahi Toru, Kobayashi Jinzo, Asai Hiroshi
Integrative Bioscience and Biomedical Engineering, Waseda University, Tokyo, Japan.
Chirality. 2004 May 15;16(5):286-93. doi: 10.1002/chir.20029.
We have achieved measuring four optical parameters simultaneously, namely, linear birefringence (LB), circular birefringence (CB), linear dichroism (LD), and circular dichroism (CD), of single crystals of Lambda-(+)(589)- and Delta-(-)(589)-tris(ethylenediamine) cobalt(III) triiodide monohydrate (1) along the <001> plane at the fixed wavelength (514.5 nm). Such measurements are possible only when the High Accuracy Universal Polarimeter (HAUP) is employed; it is called the extended HAUP method. Our experimental results showed that both LB and LD of the Lambda-(+)(589)-(1) crystal have the same magnitude as those of the Delta-(-)(589)-(1) crystal. It was also revealed for the first time that the CB data of crystals of Lambda-(+)(589)-(1) and Delta-(-)(589)-(1) are almost of the same magnitude, but are of opposite sign, reflecting their opposite absolute configurations. On the other hand, although the CD data obtained for Lambda-(+)(589)-(1) is almost three times larger than that for Delta-(-)(589)-(1,) these CD data are also opposite in sign, as expected from the opposite chirality of crystals. .
我们已经实现了在固定波长（514.5 nm）下，沿着<001>平面同时测量三水合碘化λ-(+)(589)-和δ-(-)(589)-三（乙二胺）钴（III）单晶（1）的四个光学参数，即线性双折射（LB）、圆双折射（CB）、线性二向色性（LD）和圆二向色性（CD）。只有使用高精度通用偏振计（HAUP）才能进行此类测量；这被称为扩展HAUP方法。我们的实验结果表明，λ-(+)(589)-(1)晶体的LB和LD与δ-(-)(589)-(1)晶体的大小相同。首次发现，λ-(+)(589)-(1)和δ-(-)(589)-(1)晶体的CB数据大小几乎相同，但符号相反，反映了它们相反的绝对构型。另一方面，虽然λ-(+)(589)-(1)获得的CD数据几乎是δ-(-)(589)-(1)的三倍，但这些CD数据的符号也相反，这正如从晶体相反的手性所预期的那样。
