TETRAHEDRAL ADAMANTANE DERIVATIVES - GLASS-FORMATION AND MELTING BEHAVIOR

The influence of the chemical structure of rigid star-shaped multipode s composed of an adamantane central core and short rigid branches on t he glass formation and crystallisation is analysed. It was found that esters of 1,3,5,7-adamantanetetracarboxylic acid with various phenols (3a-c) and esters of 1,3,5,7-tetrahydroxyadamantane with various benzo ic acid derivatives (4a-c) display both crystalline and glassy states with high glass transition temperatures and melting temperatures. Thes e quantities strongly depend on the restriction of the rotational moti ons about the ester groups connecting the core and the branches.