Bisphenylene-spirobifluorene compounds, method for synthesizing the same, and electroluminescence material and device having the same
View Patent ↗Provided are bisphenylene-spirobifluorene compounds, a method for synthesizing the same, and EL material and device having the same. The bisphenylene-spirobifluorene compound is defined by the following formula: wherein R 1 and R 2 are identical or different and are independently a straight-chain or branched alkyl group having from 1 to 22 carbon atoms, X 1 and X 2 independently contains one or more elements selected from the group consisting of C, O, N, S, Si and Ge, and m and n are integers from 1 to 4.
1. A method of preparing bisphenylene-spirobifluorene compound of formula:
the method comprising the steps of:
reacting a biphenyl compound of formula:
with N-bromosuccinimide followed by adding boron tribromide, and wherein R 1 and R 2 are identical or different and are independently a straight-chain or branched alkyl group having from 1 to 22 carbon atoms, and X 1 and X 2 independently contains one or more elements selected from the group consisting of C, O, N, S, Si and Ge;
forming a biphenylyl-halogenated fluoreneol compound having the X 1 R 1 and X 2 R 2 by reacting the biphenyl compound with halogenated fluoreneone;
forming a halogenated spirobifluorene compound having the X 1 R 1 and X 2 R 2 from the biphenylyl-halogenated fluoreneol compound by cyclization; and
forming a bisphenylene-spirobifluorene compound having the X 1 R 1 and X 2 R 2 by substituting halogen of the halogenated spirobifluorene compound by a phenyl group.
2. The method according to claim 1 , wherein in the step of forming the biphenylyl-halogenated fluoreneol compound, a metal-halogen ligand substitution reaction is employed.