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Article Abstract
Unconventional reduction reactions in the Nb-O-I system have produced a number of niobium oxyiodides containing the oxygen-centered [NbO] cluster. Crystalline NbOI and two modifications of NbOI were structurally characterized by means of single-crystal X-ray diffraction studies. The new compounds can be classified as members of the NbOI family, together with the already known NbOI. NbOI is represented by a molecular stucture, in which the two modifications of NbOI are forming structures with iodido-bridged strings, that can be assigned to represent one-dimensional structures. Measurements of b-NbOI single crystals reveal semiconducting behaviour, with an electrical conductivity in the order of 10 S m at 300 K and an electrical band gap estimated as 0.4 eV. The presence of varying numbers of cluster electrons in the given compounds is discussed in the light of second-order Jahn-Teller distortion.
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