2008

VanadiumI 5000 Self-Assembled All-Inorganic Chiral Polyoxovanadate: Spontaneous Resolution

of Nitrate-Incorporated Octadecavanadate. — (Bu4N)5[V18O46(NO3)]·3EtNO2 is synthesized from a EtNO2 solution of (Bu4N)4[V10O26], HNO3, and tBuOOH (stirring, a few days, 43% yield). The compound crystallizes in the orthorhombic space group P212121 with Z = 4 (single crystal XRD). A nitrate anion is incorporated at the center of the sperical polyoxovanadate cage. The structure may be regarded as a double helical V8 ribbon between two square pyramidal VO5 units, consisting of half-pitch helix with ca. 11.0 Å diameter and a half pitch length of 8 Å. The compound is the first polyoxo-vanadate with the framework of a double helix. — (KOYAMA, Y.; HAYASHI*, Y.; ISOBE, K.; Chem. Lett. 37 (2008) 6, 578-579; Dep. Chem. Sci., Grad. Sch. Nat. Sci. Technol., Kanazawa Univ., Kanazawa 920, Japan; Eng.) — W. Pewestorf

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