This work developed three high-nuclearity {Co-14} clusters of C1-C3 with inner [Co-8] backbone fixed by six ambient CoCl2 species. The catalyst C1 exhibited highly regio- and stereoselective hydrosilylation of alkynes with primary and secondary silane to produce alpha-vinylsilanes. More importantly, C1 shows high regioselectivity for electronically unbiased alkyl alkynes, and the alpha-selectivity of some alkyl alkynes has not been achieved in previous reports. Leaching tests and reusability proved that the reaction is a heterogeneous process.

We report here a zinc2+-dpbt MOF with luminescence sensing properties for the detection of Cu2+, Ag+, MnO4− and Cr(vi) (Cr2O72−, CrO42−) ions.

A unique three-dimensional zinc(II)-dpbt framework with formula {[Zn6Cl6(2,2′-dbpt)3]·4.5H2O}n (1) (here, 2,2′-H2dpbt = 5,5′-di(pyridin-2-yl)-3,3′-bi(1,2,4-triazole)) has been successfully constructed under solvothermal conditions. This complex was fully characterized via single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction, infrared spectroscopy, thermogravimetric analyses, luminescence spectroscopy, UV-vis spectroscopy, EDS and ICP-MS. The luminescence properties confirm that the emission behavior of the Zn(II) complex exhibits excellent thermal and chemical stabilities. The luminescence performance of 1 in a series of cations and anions was also explored. Importantly, the luminescence experiments reveal that 1 is sensitive, efficient and can be quickly regenerated (at last 4 cycles) as a fluorescent probe for detecting Cu2+, Ag+, MnO4− and Cr(VI) (Cr2O72− and CrO42−) ions.

Reactions of the bis((pyridine-2-yl)-1,2,4-triazol-5-yl)methane (H2L) with Zn(NO3)2·6H2O and ZnCl2 conditions afforded three new Zn(II) complexes, namely, {[Zn3L′2(H2O)6]·2NO3} (1), [Zn4L2Cl4(H2O)2] (2) and [Zn6L4(CH3OH)4(NO3)4] (3). Notably in 1, the methylene group in L was in situ oxidized to a rigid ketone group in L′ (here, H2L′ = bis((pyridine-2-yl)-1,2,4-triazol-5-yl)ketone). The three Zn(II) complexes were synthesized under solvothermal conditions and characterized by techniques of Elemental analysis, Fourier transform infrared spectroscopy, Powder X-ray diffraction and single-crystal X-ray diffraction analysis. In addition, the thermogravimetric properties and the luminescent properties of 1–3 were investigated.