@article {15331, title = {The Structure of (NO)2[Ho(NO3)5], A 10-Coordinate Species}, journal = {Canadian Journal of Chemistry}, volume = {53}, year = {1975}, pages = {831-835}, abstract = {Nitrosonium pentanitratoholmate(III), (NO)2Ho(NO3)5, was prepared from holmium metal and dinitrogen tetroxide in anhydrous ethyl acetate. Its crystals are monoclinic with\ a = 8.094,\ b = 11.979, c = 14.170 {\r A} and β = 104.7{\textdegree},Z\ = 4, space group\ P21/c. The structure was solved by the heavy-atom method and refined by full matrix least-squares methods to an\ R\ value of 0.085 for 1514 observed reflections measured on the G.E. XRD-6 diffractometer. The structure consists of one Ho(NO3)52-\ and two NO+\ ions. The holmium is 10-coordinated by five essentially symmetric bidentate nitrate groups which arrange themselves in a trigonal bipyramidal fashion around the metal with a mean Ho{\textemdash}O distance of 2.45 {\r A}. The two NO+\ ions per metal occupy slightly different environments and give rise to two i.r. bands at 2250 and 2285 cm-1, attributable to the (N, O+) stretching vibration. The mean N{\textemdash}O distance within these ions is 1.00 {\r A}.}, url = {https://doi.org/10.1139/v75-116}, author = {Chung Chieh and Gerald E. Toogood} }