CRYSTAL-STRUCTURE OF 4-ETHYLVANADATRANE-1-ONE

An X-ray diffraction study of a substituted vanadatrane-1-one (space g roup Pna2(1), R = 0.019 for 1394 reflections, the absolute structure w as determined) showed that the geometry of its atrane framework is sim ilar to that of the Si- and Ge-analogs. The bond lengths are: V=O, 1.6 14(2) angstrom; V<--N, 2.329(2) angstrom; V-O, 1.800-1.806(2) angstrom . The deviation of the V atom having distorted trigonal bipyramidal co ordination from the equatorial plane of the O atoms is 0.35 angstrom, the O=V<--N bond angle is 179.4(1)-degrees.