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A pyrazoline-containing starburst molecule, 4,4′,4″-tris[(1,3-diphenyl-4,5-dihydro-1Hpyrazol)-5-yl]-triphenylamine (Tris-5-DPP), was synthesized in a facile way, which can form amorphous thin films with glass transition temperature as high as 136 ℃.