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À propos de : Synthesis and Crystal Structure ofTetrakis(2-pyridinecarboxylato)niobium(IV)−2-Ethanol, an Octacoordinate Dodecahedral d1M(A-B)4 System        

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  • Synthesis and Crystal Structure ofTetrakis(2-pyridinecarboxylato)niobium(IV)−2-Ethanol, an Octacoordinate Dodecahedral d1M(A-B)4 System
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  • The red-purple[Nb(pyc)4]·2C2H5OHcomplex is obtained by reaction of zinc-reduced ethanolic solutions ofniobium pentachloride with 2-pyridinecarboxylic acid. TheNb(IV) atom is octacoordinate, with four 2-pyridinecarboxylateligands spanning the Hoard−Silverton designated m edges ofa dodecahedron (D2d).The π-donor oxygen atoms of the ligand (Nb−Oav =2.009 Å) occupy the A sites, while the π-acceptor nitrogen atoms(Nb−Nav = 2.302 Å) reside at the B sites. This isthe first experimental evidence for Orgel's postulate regardingoctacoordinate d1 M(A-B)4stereochemistry.
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