Abstract
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) A ̊ . There are 12 molecules in the whole cell of 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 = 0.04 and R w = 0.04 for 3468 independent reflections ( I ⩾ 1.5 σ( I)). The crystal structure exhibits stacking disorder, a simple basic pseudostructure being modulated over the b-axis to give the triple true cell. Coordination about each thorium atom is a slightly distorted tetrahedron. The Th-C distances to the five membered rings of the indenide ligands indicate trihapto character of the metal-carbon bonding.
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