π-Conjugated Organoboron Polymers via the Vacant p-Orbital of the Boron Atom

Abstract

A decade has passed since organoboron -conjugated systems highly extended through the empty p-orbital of the boron atom emerged as a new class of -conjugated materials. Making use of convenient hydroboration polymerization, a variety ofconjugated organoboron polymers exhibiting fluorescence emission, n-type electrochemical activity, electrical conductivity, third order non linear optical property, anion sensing ability is easily prepared. The organoboron -conjugated polymers having highly bulky substituent on the boron atom shows high stability under air and moisture and therefore, potentially useful for versatile applications.The design of electron deficient organoboron -systems led to observation of unique photophysical behavior such as extraordinary high third order non linear optical susceptibility, facilitation of p-d à transition, intramolecular charge transfer, unusually activated -conjugative interaction and so forth.In addition to boration polymerization methods, polycondensation using di-Grignard reagent, Sonogashira type polycondensation, polycondensation via tin-boron exchange are useful for synthesis of -conjugated organoboron polymers.

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