Crystal structure of tris(nitrato-O,O′)bis(1,10-phenanthroline-N,N′)- cerium(III), Ce(NO3)3(C12H8N2)2

Q.-Y. Lin, Y.-L. Feng
2003 Zeitschrift für Kristallographie - New Crystal Structures  
C 24H16CeN7O9, monoclinic, C12/c1 (No. 15), a = 11.162(2) Å, b = 18.070(4) Å, c = 13.102(3) Å, b = 100.56(3)°, V = 2597.9 Å 3 , Z = 4, R gt(F) = 0.021, wRref(F 2 ) = 0.056, T = 293 K. Source of material To a solution of 1,10-phenanthroline (0.5 mmol) and lysine (0.5 mmol) in 15 mL of hot water was added Ce(NO 3)3 · 6H2O (0.5 mmol). The mixture was stirred for 2 h, resulting in a light yellow solution. The yellow prism crystals suitable for structure determination were isolated by slow
more » ... d by slow evaporation of the solvent at room temperature. Experimental details Lower symmetry space groups that break the 2-fold axis were tested. No indications of lower symmetry were observed. Thus, the final refinement was done using the space group C2/c. We have not clear explanations for the extremely high U ij values for the positions O4, O5 and N4 atoms which were also observed in the complex Bi(NO 3)3(phen)2 [1]. Discussion Rare earth metal complexes are of growing importance because of their chemical [2], biochemical and medicinal applications [3]. A series of isostructural lanthanum-phen-nitrato complexes with general formula Ln(NO 3)3(phen)2 (Ln = La [4], Gd [5], Pr, Nd, Sm, Eu, Dy [6], Lu [7] ) have been reported. Ce(NO 3)3(phen)2 is another member of the Ln(NO3)3(phen)2 family. The crystal structure is built up by two 1,10-phenanthroline molecules and three nitrato groups. The Ce atom is surrounded by six O atoms from three nitrato groups and four N atoms from two 1,10-phenanthroline ligands. The environment around Ce atom can be described as a distorted dicapped square antiprism with N1, N2, O4, O2a and N1a, N2a, O4a, O2 (symmetry code: (a) 1-x, y, 0.5-z) at the tetragonal bases. The distances between Ce, capped O1 atom and the base plane are -1.096(2) Å and 1.457 (2) Å, respectively. The average bond langth of Ce-O and Ce-N are 2.566 Å and 2.641 Å, respectively. Z. Kristallogr. NCS 218 (2003) 531-532 531
doi:10.1524/ncrs.2003.218.4.531 fatcat:xeuhzherabfnxgamsjieh5qjhe