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Synthesis and characterization of octakis(3,3,3-trifluoropropyldimethylsiloxy)cyclotetrasiloxane (I), octakis[tridecafluoro-2,2,5,5-tetramethyl-2,5-disilatridecanoxy]cyclotetrasiloxane (II) and octakis(7-pentafluorophenyl-2,2,5,5-tetramethyl-2,5-disilahep