RESUMO
The development of the most promising electro-catalysts for the high-performance hydrogen evolution reaction (HER) in neutral media is exceedingly desirable. Here, the convenient hydrothermal reaction of PbI2, 3-pyrazinyl-1,2,4-triazole (3-pt), KI, and methanol in HI aqueous solution acquired an organic hybrid iodoplumbate [mtp][Pb2I5][PbI3]·0.5H2O (denoted as PbI-1, mtp2+ = 3-(1,4-dimethyl-1H-1,2,4-triazol-4-ium-3-yl)-1-methylpyrazin-1-ium), which not only provided an infrequent in situ organic mtp2+ cation that originated from the hydrothermal N-methylation reaction of 3-pt in acidic KI solution but also offered the rare example of organic hybrid iodoplumbate incorporating both one-dimensional (1-D) [PbI3-]n and two-dimensional (2-D) [Pb2I5-]n polymeric anions with one configuration of the mtp2+ cation. PbI-1 was applied for the construction of a Ni nanoparticle decorating the PbI-1 electrode (Ni/PbI-1/NF) via successive coating and electrodeposition onto the porous Ni foam (NF) support. The fabricated Ni/PbI-1/NF electrode that served as the cathodic catalyst showed excellent HER electro-catalytic activity.
RESUMO
The exploration of an excellent triple sensor for monitoring Cu2+, Fe3+, and Cr2O72- ions is of exceeding significance because of their serious effects on the human body. Herein, optically active 1H-3,5-bis(pyrazinyl)-1,2,4-triazole (Hbpt) with triazolyl and pyrazinyl groups was applied for the construction of a new type of organic hybrid cadmium iodide [Cd6I8(bpt)4(H2O)4]·2H2O (1) incorporating a hitherto-unknown [Cd3I4(H2O)2]2+ trimeric-cationic unit, which shows an orange light emission at 589 nm with a large Stokes shift of 246 nm. In virtue of the existence of free bifunctional azole sites as the receptors, 1 exhibits a highly selective and sensitive sensing property toward Cu2+, Fe3+, and Cr2O72- ions in aqueous solution with lower detection limits of 0.70â¼4.46 ppm, which offers the sole example of cadmium iodide as an excellent triple sensor for detecting Cu2+, Fe3+, and Cr2O72- ions. Moreover, temperature-dependent luminescent determinations also reveal that 1 can be used as the potential luminescent molecular thermometer.
