Cityu Research Limited

Bao-Xiu Mi

Shuit-Tong Lee

Chun-Sing Lee

Peng-Fei Wang

Zhi-Qiang Gao

Liang-Sun Hung

A compound of formula [I]:X&#x2014;R[I]wherein X represents the group: and R is either (i) represented by the formula [II] wherein n is 1 or 2, and the or each Rgroup is independently selected from the group consisting of hydrogen and halogen atoms, cyano, nitro, mercapto, carbonyl and sulfone groups, and optionally substituted alkyl, haloalkyl, hydroxyalkyl, aryl, alkoxy, aryloxy, alkylamino, arylamino, alkylthio, arylthio, ester, siloxy, cyclic hydrocarbon and heterocyclic groups;or (ii) is selected from the group consisting of optionally substituted alkyl, hydroxyalkyl, aryl, cyclic hydrocarbon and heterocyclic groups;wherein in each case R&#x2013;Rare each independently selected from the group consisting of hydrogen and halogen atoms, cyano, nitro, mercapto, carbonyl and sulfone groups, and optionally substituted alkyl, haloalkyl, hydroxyalkyl, aryl, alkoxy, aryloxy, alkylamino, arylamino, alkylthio, arylthio, ester, siloxy, cyclic hydrocarbon and heterocyclic groups. The compounds are useful as hole-transporting materials in electroluminescence devices.

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Bao-Xiu Mi