ABSTRACT
Phenylene-bridged macrocage molecules were synthesized as molecular gyrotops because the rotor can rotate even in a crystal. The chain-length-dependent properties of the molecular gyrotops were investigated in order to explore the potential to create new molecular materials. The formation of the cage in the synthesis of each molecular gyrotop depended on the length of the alkyl chains of the precursor. The rotation modes and energy barriers for phenylene rotation inside the crystals of the molecular gyrotops were changed by varying the chain length of the cage.
Subject(s)
Benzene Derivatives/chemical synthesis , Bridged-Ring Compounds/chemical synthesis , Benzene Derivatives/chemistry , Bridged-Ring Compounds/chemistry , Crystallography, X-Ray , Models, MolecularABSTRACT
A new class of D(3)-symmetric tris(spiroborate) cyclophanes has been designed and prepared for the construction of supramolecular chain structures by iterative host-guest interaction with ditopic guest molecules. The treatment of these compounds with [Ir(tpy)(2)](PF(6))(3) complex in solution led to the formation of the chain structure, which was confirmed by (1)H NMR and CSI-MS studies. The chain structure exhibited rapid temperature-responsive gelation behavior in their HMPA solution.