Patent ID: 8436173

Claim:
A boron compound of the following formula (1): wherein R 1 , R 2 , and R 3 are the same or different from each other and are each independently an aryl group or a heterocyclic group, each of which optionally has at least one substituent group, or any two of R 1 , R 2 , and R 3 are combined with each other to form a ring; R 4 is a hydrogen atom or a substituent group; m is an integer of from 0 to 2; when m is 2, plurally occurring R 4 's are the same or different from each other; Q is a linking group; X is a nitrogen atom, an oxygen atom, a sulfur atom, a phosphorus atom, or a selenium atom; a dashed half arc indicates that Q and X may be part of a common ring; dashed and solid lines between Q and X indicate a single or double bond; an arrow directed from X to B indicates a coordinate bond; R a is hydrogen or a monovalent, divalent, trivalent, or tetravalent organic framework; n is an integer of from 1 to 4; and when n is an integer of from 2 to 4, plurally occurring R 1 's, R 2 's, R 3 's, R 4 's, m's, Q's, X's, dashed half arcs, and dashed and solid lines between Q and X are the same or different from each other, respectively.