US EPA

1698799 

Journal Article 

Crystal structure of beryllium nitrate complexes (NO)(2)[Be(NO3)(4)] and Be4O(NO3)(6) 

Troyanov, SI; Tikhomirov, GA; Znamenkov, KO; Morozov, IV 

2000 

1 

Russian Journal of Inorganic Chemistry
ISSN: 0036-0236
EISSN: 1531-8613 

45 

12 

1791-1798 

WOS:000166244900001 

Dinitrosonium tetranitratoberyllate (NO)(2)[Be(NO3)(4)] (I) was prepared. by the reaction of BeCl2 with liquid N2O4 in the presence of ethyl acetate. The crystal structure of I is orthorhombic: a = 13.471(4) Angstrom, b = 23.910(6) Angstrom, c = 6.229(2) Angstrom, Z= 8, space group Fdd2, R-1 = 0.0412. The structure is built from nitrosonium cations (N-O 0.916(9) Angstrom) and [Be(NO3)(4)](2-) anions with tetrahedral coordination of Be (the Be-O distances are 1.627-1.641(9) Angstrom) and monodentate nitrate groups. The thermal decomposition of I yields trigonal modification of beryllium oxonitrate, Be4O(NO3)(6) (II): a = 13.638(3) Angstrom, c = 6.475(2) Angstrom, Z = 3, space group P3, R-1 = 0.0585. The structure of II is built of tetranuclear Be4O(NO3)(6) molecules with the tetracoordinated central O atom (Be-O 1.59-1.64 Angstrom), forming the OBe4 tetrahedron, and six bidentate NO3 groups coordinated to each of the Be . . . Be edges with the Be-O distances of 1.60-1.72 Angstrom. It seems that II is a high-temperature modification of beryllium oxonitrate.