Shuttlecock-like Secondary Building Units Research Articles

A window frame-like square constructed by bridging Co4-(TC4A-SO2) SBUs with 1,3-bis(2H-tertazol-5-yl)benzene

A calixarene-based compound {[Co4(H2O) (TC4A-SO2)]4(DTB)8} (H4TC4A-SO2 = p-tert-butylsulfonylcalix[4]arene; H2DTB = 1,3-bis(2H-tetrazol-5-yl)benzene) was obtained under solvothermal condition. The compound was characterized by single crystal X-ray diffraction, elemental analysis, TG analysis and FT-IR spectroscopy. In the structure, the Co4-(TC4A-SO2) shuttlecock-like secondary building units (SBUs) are bridged by the DTB ligands into some window frame-like squares, which are further stacked into an extended structure by supramolecular interactions. The results of magnetic measurements indicated an antiferromagnetic interaction between the metal centers. In order to evaluate its porosity, the gas sorption measurement was carried out.

Open Pentameric Calixarene Nanocage

A novel open helmetlike coordination cage has been synthesized based on Co4-calixarene shuttlecock-like secondary building units and in situ generated phosphate anions, where the opening of the cage comprises a large 16-membered ring. The above unprecedented Co20 nanocage presents the first pentameric calixarene coordination compound. Sorption behavior and magnetic properties are also investigated.

A zigzag ladder-like metal–organic aggregate based on Co4-TC4A subunits and aromatic tricarboxylic acids

A new calixarene-based compound {[Co4Cl(TC4A)][Co4Cl(TC4A)(CH3OH)2 (H2O)2]}(PTC)2 (H4TC4A=p-tert-butylthiacalix[4]arene and H3PTC=biphenyl-3,4′,5-tricarboxylic acid) was obtained by solvothermal synthesis, and structurally determined by single crystal X-ray diffraction, EDS analysis, XRD analysis, TG-DTA analysis and IR spectroscopy. The structure was featured with some zigzag metal–organic ladders, which were constructed by bridging double Co4-TC4A shuttlecock-like secondary building units (SBUs) with PTCs. In order to evaluate its porosity, the N2 sorption measurement was carried out.

A tetragonal prismatic {Co32} nanocage based on thiacalixarene

A novel coordination nanocage was obtained with in situ-generated tetrazole ligands from the cobalt-thiacalix[4]arene system. Four in situ-generated 1,3-bis(2H-tetrazol-5-yl)benzene ligands bolster eight Co4-calix shuttle-cock-like secondary building units (SBUs) into a hollow tetragonal prism with a high surface area. The unprecedented {Co32} nanocage presents the highest nuclearity example.

Bridging calixarene-based {Co4} units into a square or belt with aromatic dicarboxylic acids

Three new calixarene-based compounds were constructed by bridging Co4-TC4A shuttlecock-like secondary building units (SBUs) with aromatic dicarboxylic acids, two featured with isolated squares and the third featured with a wavelike belt.