Phosphoric acids as amplifiers of molecular chirality in liquid crystalline media.

نویسندگان

  • Rienk Eelkema
  • Ben L Feringa
چکیده

[structure: see text] A new system for the double amplification of the molecular chirality of simple chiral amines in achiral liquid crystalline media is described. It involves a conformationally flexible phosphoric acid based receptor that by binding to chiral amines induces chirality in the liquid crystalline matrix. Efficient cholesteric phase formation was shown by several chiral amines that were not able to induce measurable helicity in nematic liquid crystals by themselves.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Macroscopic expression of the chirality of amino alcohols by a double amplification mechanism in liquid crystalline media.

The central chirality of simple amino alcohols was amplified by binding to a dynamically axially chiral biphenol receptor and expressed as supramolecular chirality by effecting a change from a nematic to a cholesteric liquid crystalline phase.

متن کامل

Supramolecular chirality in crystalline assemblies of bile acids and their derivatives; three-axial, tilt, helical, and bundle chirality.

Steroidal bile acids and their derivatives exhibit characteristic inclusion behaviors in the crystalline state. Their crystals present varied assemblies due to asymmetric molecular structures, which relate to supramolecular properties through cooperative weak interactions. An overview indicates that the steroidal assemblies lie in an intermediate position among various molecules and have hierar...

متن کامل

Phase Transformations in Chiral Non-racemic Main-chain Liquid Crystalline Polyesters Involving Double-twist Helical Crystals

It is for the first time the double-twisted helical single lamellar crystals were observed in a series of synthetic chiral non-racemic main-chain liquid crystalline polyesters. Phase structure and transition behaviors were investigated. Multiple liquid crystalline phases were found including the twisted grain boundary phase. During crystallization, the chain molecules kept their memory of the p...

متن کامل

Chiral Liquid Crystals: Structures, Phases, Effects

The introduction of chirality, i.e., the lack of mirror symmetry, has a profound effect on liquid crystals, not only on the molecular scale but also on the supermolecular scale and phase. I review these effects, which are related to the formation of supermolecular helicity, the occurrence of novel thermodynamic phases, as well as electro-optic effects which can only be observed in chiral liquid...

متن کامل

Chiral Interactions and Structures

The chiral structure of liquid crystalline phases arises due to the intrinsic chirality of the constituent mesogens. While it is seemingly straightforward to quantify the macroscopic chirality by using, for instance, the cholesteric pitch or the optical rotatory power, it is not as simple to quantify the chirality of a single molecule. I will discuss a systematic quantification of molecular chi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Organic letters

دوره 8 7  شماره 

صفحات  -

تاریخ انتشار 2006