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The thermal reaction of an octathexyloctasilacubane, R8Si8 (R = thexyl: 1,1,2-trimethypropyl), with sulfur in a sealed tube gave a sulfur-inserted novel compound, R8Si8S, together with an unexpected ring-opening compound. The reaction with selenium in a similar condition gave a ring-opening compound exclusively. With tellurium, the thermal reaction of the octasilacubane resulted in the formation of a tellurium-inserted compound (R8Si8Te), which was decomposed in solution to give the octasilacubane and tellurium. [ABSTRACT FROM AUTHOR]

Cocrystallization of all-cis-tetraisopropylcyclotetrasiloxanetetraol and diisopropylsilanediol gave single crystals, which were proved to have a nano-size tube-like aggregate structure. Six molecules of the cyclic tetraol and four molecules of the diol form an asymmetric unit by means of hydrogen bonding. The structure and properties of the aggregates are discussed in detail, and also the possibility of solid-state synthesis of siloxanes is described. [ABSTRACT FROM AUTHOR]

Molecular recognition of dicarboxylates by a dinuclear zinc(II) complex of 2,2ʹ-binaphthalene bearing di(2-pyridyl)aminomethyl groups at 8- and 8ʹ-positions ([Zn2L]4+) by UV-vis and fluorescence spectral titrations in an aqueous solvent was investigated. In a series of α,ω-dicarboxylate, receptor [Zn2L]4+ showed the highest binding affinity for succinate and UV-vis and fluorescence changes were also largest upon the addition of this guest. In a series of phthalate derivatives, phthalate was strongly bound by [Zn2L]4+. The characteristic UV-vis and fluorescence changes strongly depend on the dihedral angle of two naphthyl groups of the complex [Zn2L]4+· dicarboxylate estimated by spectral titrations and DFT calculations. [ABSTRACT FROM AUTHOR]