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Not So Similar: Different Ways of Nb(V) and Ta(V) Catecholate Complexation
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Not So Similar: Different Ways of Nb(V) and Ta(V) Catecholate Complexation
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Journal Article
Not So Similar: Different Ways of Nb(V) and Ta(V) Catecholate Complexation
2023
Overview
The reactions between catechol (H2cat) and niobium(V) or tantalum(V) precursors in basic aqueous solutions lead to the formation of catecholate complexes of different natures. The following complexes were isolated and characterized by single-crystal X-ray diffraction (SCXRD): (1) (NH4)3[NbO(cat)3]∙4H2O; (2) K2[Nb(cat)3(Hcat)]·2H2cat·2H2O; (3) Cs3[NbO(cat)3]·H2O; (4) (NH4)4[Ta2O(cat)6]·3H2O; (5) Cs2[Ta(cat)3(Hcat)]·H2cat; (6) Cs4[Ta2O(cat)6]·7H2O. The isolated crystalline products were characterized by elemental analysis, X-ray powder diffraction (XRPD), FTIR, and TGA. The structural features of these complexes, such as Ta2O unit geometry, Cs-π interactions, and crystal packing effects, are discussed.
Publisher
MDPI AG,MDPI
Subject
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