Bis(1,3,4-thia­diazol-2-yl) disulfide

The title compound, C4H2N4S4, lies about a twofold rotation axis situated at the mid-point of the central S—S bond. Each of two thia­diazole rings is essentially planar, with an rms deviation for the unique thia­diazole ring plane of 0.0019 (7) Å. C—H⋯N hydrogen bonds link adjacent mol­ecules, forming zigzag chains along the c axis. In addition, these chains are connected by inter­molecular S⋯S inter­actions [S⋯S = 3.5153 (11) Å] , forming corrugated sheets, and further fabricate a three-dimensional supra­molecular structure by inter­molecular N⋯S contacts [S⋯N = 3.1941 (17) Å]

3-(2-Thioxo-1,3-dithiol-4-ylsulfan­yl)­propane­nitrile

The title compound, C6H5NS4, consists of a planar 2-thioxo-1,3-dithiol-4-ylsulfanyl unit [maximum deviation from the ring plane = 0.0325 (2) Å], with a cyano­ethyl­sulfanyl substituent in the 4-position. In the crystal structure, weak inter­molecular C—H⋯S hydrogen bonds together with S⋯N inter­actions [3.260 (5) Å] form two-dimensional layers in the bc plane

4-Bromo-5-[(2-bromoethyl)sulfanyl]-1,3-dithiole-2-thione

The title compound, C5H4Br2S4, consists of a statistically planar, 4-bromo-1,3-dithiole-2-thione unit [maximum deviation from the ring plane 0.001 (2) Å], with a bromoethylsulfanyl substituent in the 5-position. In the crystal structure, weak intermolecular S...S [3.438 (15) and 3.522 (15) Å] and S...Br [3.422 (14) and 3.498 (14) Å] interactions generate a three-dimensional supramolecular architecture

A stable N-containing heterocyclic carboxylic acid ligand Co-MOF for photoelectric performance and anionic dyes adsorption

Metal-organic frameworks (MOFs) are crystalline porous hybrid materials with periodic network structure and abundant active sites, which are promising adsorbents for organic pollutants. Herein, a novel Co(II)-based organic framework (Co-MOF) [Co2(L1)2(L2)] (L1 = 3-(3-carboxylphenyl) isonicotinic acid, L2 = 4, 4′-Azopyridin) was developed for selective dyes adsorption. Experiments suggest that the Co-MOF exhibits high stability, good photoelectricity and high selectivity for dyes adsorption. For dyes adsorption, the Co-MOF shows a strong adsorption to methyl orange achieving a high capacity up to 440.5 mg g−1, but shows a weak adsorption to methylene blue or rhodamine, indicating its better selectivity for anionic dyes. An insight into the selective removal of the methyl orange is being accounted for by acid-base attraction, anion-π and π–π stacking interactions, involving the Co ion, phenyl rings, and ocarboxylate of L, and the phenyl rings, and osulfonate of MO. The current work contributes to the development of future multifunctional MOF materials with the application in environment protection

A novel redox-active calix[4]arene-tetrathiafulvalene dyad

International audienc