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A prominent early synthetic application of organoniobium chemistry was the use of dimethoxyethane niobium trichloride, NbCl 3 (DME), as a reagent for the reductive coupling of imines with carbonyl compounds to form amino alcohols. [9] This reagent has found further use in other pinacol-type reductive couplings. [10] [8]
Niobium(IV) iodide is a grey solid that reacts with water. [1]Niobium(IV) iodide is an orthorhombic crystal with space group Cmc2 1 (No. 36). [3] Its crystal is formed by NbI 6 octahedra connected by edges and also contains Nb-Nb bonds.
The compound adopts an edge-shared bioctahedral structure, which means that two NbI 5 units are joined by a pair of iodide bridges. There is no bond between the Nb centres. [ 2 ] Niobium(V) chloride , niobium(V) bromide , tantalum(V) chloride , tantalum(V) bromide , and tantalum(V) iodide , all share this structural motif.
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Niobium(V) chloride is the main precursor to the alkoxides of niobium, which find uses in sol-gel processing.It is also the precursor to many other Nb-containing reagents, including most organoniobium compounds.
NbO adopts an unusual cubic structure, similar to the rock salt structure but with some missing atoms compared to it, so that both niobium and oxygen atoms have square planar coordination geometries.
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Niobium nitride's main use is as a superconductor. Detectors based on it can detect a single photon in the 1-10 micrometer section of the infrared spectrum, [4] which is important for astronomy and telecommunications.