The four polymorphs of the ternary molecular salt cocrystal (3-hydroxypyridinium)·(9-anthracenecarboxylate)·(trinitrobenzene) show different colours and crystal habitats. These polymorphs exhibit different photoluminescent properties.
Hydrogen-atom tunneling was observed for monomers of 2-thiouracil, 1-methyl-2-thiouracil and 6-aza-2-thiouracil isolated in low-temperature matrices. The photoproduced higher-energy oxo-thiol tautomer converted into the lowest-energy oxo-thione form.
A novel polymorph of the furosemide–ethenzamide cocrystal was selectively synthesized via kinetic crystallization, revealing morphotropic packing and enhanced solubility.
Ru(IV)–Ru(IV) complexes having CO32− or HCO3− on the {Ru2(μ-O)2} diamond core were isolated and structurally characterized. The electrochemical and spectroscopic behaviors with those of Ru(III)–Ru(IV) species were compared and their reactivities were reported.
Latest advances in the chemistry of pyramidanes, a novel type of the polyhedral clusters featuring main group element at the inverted tetrahedral apical position, are overviewed, highlighting their synthetic strategies and specific reactivity.