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In the light of NMR data on product profiles, the structure of an Alicyclobacillus sp. CAZy family GH13 α-amylase highlights the accommodation of branch points in the α-amylase active centre.

The aqueous solution chemistry of niobium is rather unexplored, and well characterized aqua complexes are scarce. In this work, a new niobium aqua ion is obtained upon treatment of Zn-reduced ethanolic solutions of NbCl5 with HCl in the presence of a sulfide source. The red aqua ion, obtained upon cation-exchange chromatography, forms readily the thiocyanate complex which has been crystallized as Cs(4.26)Na(1.74)[Nb4SO5(NCS)10] . 0.33H2O. X-ray crystallography revealed an unprecedented metal-metal bonded tetranuclear Nb4(mu4-S)(mu2-O)5(4+) core with a capping mu4-S ligand.

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Niobium I 5100 An Unprecedented Tetranuclear Niobium Aqua Ion with a Capping µ 4 -Sulfido Ligand. -A new red niobium aqua ion, [Nb4O5S(H2O)10] 4+ , is obtained upon treatment of Zn-reduced ethanolic solutions of NbCl5 with HCl in the presence of a sulfide source. The red aqua ion readily forms a thiocyanate complex which is crystallized as cesium/sodium salt (IV). This compound crystallizes in the hexagonal space group P6 3 /m with Z = 6. The [Nb 4 O 5 S(NCS) 10 ] 6anion consists of an unprecedented metal-metal bonded tetranuclear Nb4(µ4-S)(µ2 core with a capping µ4-S ligand. -(OOI*, B.-L.; SOETOFTE, I.; BENDTSEN, M. F.; MUNCH, A.; NIELSEN, L. C.; HENRIKSEN, J.; Inorg. Chem. 44 (2005) 3, 480-482; Dep. Chem., Tech. Univ. Den., DK-2800 Lyngby, Den.; Eng.) -Schramke 14-021 -O) 4+ 5