The configuration of the Ni(en) ring is a gauche-gauche-gauche type with the azimuthal angles of 46 ° and 56 °. Considerable distortion of the octahedral coordination in [Ni(en)3] ++ is observed. The N-O distance in NO~-is 1.21 2~. The optical properties and the infra-red spectrum of the compound are also discussed.

No abstract

No abstract

No abstract

The structure of Te204. HNO3 (the product of dissolving Te or TeO2 in HNO3) has been determined from visual intensities collected with Mo Ke radiation, and refined to R = 7 Vo. The crystals are orthorhombic, Pnma, with 4 formula units in a unit cell of dimensions a= 14-55, b = 8.77, c = 4-45/~. The structure consists of puckered layers of tellurium and oxygen atoms. Each tellurium atom is linked to one other by two oxygen bridges and to two others by a single oxygen bridge each. The four telluriumoxygen bonds around a tellurium atom are directed approximately toward the axial and two equatorial apices of a trigonal bipyramid. The tellurium-oxygen bond lengths range from 1.88 to 2-16/~, with an average estimated standard deviation of 0.015/~. The nitrate group is hydrogen-bonded to one of the bridging oxygen atoms, with O... O = 2"75 ,~.