title: Hydrogen-bonded cyclic tetramers based on ureidopyrimidinones attached to a 3,6-carbazolyl spacer.
abstract: Direct attachment of two 2-ureido-4-[1H]-pyrimidinone (UPy) subunits to a 3,6-carbazolyl core gives rise to a highly viscous, supramolecular polymer. However, insertion of a methylene spacer between the UPy's and the carbazole leads to a well-defined, cyclic tetramer, in a belt-shaped arrangement, as evidenced by MALDI-TOF, DOSY, and NOESY spectra.
authors: Institute of Chemical Research of Catalonia (ICIQ), 43007-Tarragona, Spain.
authors: Yong
authors: Y
authors: Yang
authors: Min
authors: M
authors: Xue
authors: Laura J
authors: LJ
authors: Marshall
authors: Javier
authors: J
authors: de Mendoza