Synthesis and crystal structure of Zn2[(UO2)3(SeO4)5](H2O)17

Topologically and geometrically flexible structural units in seven new organically templated uranyl selenates and selenite–selenates

“…The diversity of polyhedral units found in uranyl compounds is unique, starting from isolated complexes [1][2][3] and clusters [4][5][6][7] to cage compounds [8][9][10][11] and nanotubules [12][13][14]. Selenium-containing uranyl oxysalts are known for both monoand divalent inorganic cations [15][16][17][18][19], as well as for organic template molecules of various charge and structure [20][21][22][23][24]. The crystal structures of uranyl selenates and selenites are based upon a variety of complex units formed by polymerization of U and Se coordination polyhedra.…”

Synthesis and crystal structures of M2[(UO2)3(SeO4)5](H2O)16 (M=Co, Zn)

“…The compounds Co 2 [(UO 2 ) 3 (SeO 4 ) 5 ](H 2 O) 16 There are in total five Se atoms per formula unit. However, the structure contains six Se sites, tetrahedrally coordinated by four O atoms each.…”

“…The new compounds M 2 [(UO 2 ) 3 (SeO 4 ) 5 ](H 2 O) 16 (M = Co, Zn) are closely related to the structure of ␣- Table 2 Atomic coordinates and displacement parameters (Å 2 ) for Co 2 …”

“…Due to the tendency of uranyl complexes to have layered structures [13], the diversity of sheets is especially remarkable. The U:T ratio for the [(UO 2 ) n (TO 4 ) m (H 2 O) p ] sheets may take up the values of 1:2 [1-3,5,10], 2:3 [14], 3:5 [14][15][16][17], 5:8 [10,18] and 4:7 [19]. For each of these values, several topologically different sheet structures are possible, and geo- Note:…”

“…The positions of H atoms were not located. The final atomic positional and displacement parameters are given in Tables 2 and 4 16 , respectively. Selected interatomic distances are in Tables 3 and 5, respectively (Tables 2-5).…”