X-RAY CRYSTAL STRUCTURE ANALYSIS OF TETRAKIS-INDENYL-THORIUM
Th (C-9H-7)-4 crystallizes in space group Pna2-1 with cell dimensions a = 22.403(5), b = 36.034(7), c = 9.566(2)ANGSTROEM. There are 12 molecules in the whole cell from which three are symmetrically independent. Three dimensional x-ray intensity data were collected with an Enraf-Nonius four circle diffractometer. The structure was solved by direct methods, Fourier techniques and full matrix refinement. The agreement factors are R = 0.08 and Rw = 0.04 for 3468 independent reflections (I >or= 1,5 sigma (I)). The crystal structure exhibits stacking desorder, a simple basic pseudostructure being modulated over the b- axis to give the triple true cell. Coordination about each Th atom is a slightly distorted tetrahedron. The Th-C distances to the five membered rings of the indenide ligands indicate a trihapto character of the metal carbon bonding.
Bibliographic Reference: "ACTINIDES '85", AIX-EN-PROVENCE (FRANCE), SEPT. 2-6, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32238 ORA
Availability: Can be ordered online
Record Number: 1989124010300 / Last updated on: 1987-01-01
Available languages: en