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Th(C{sub 8}H{sub 8})Cl{sub 2}(OC{sub 4}H{sub 8}){sub 2} crystallizes in two modifications. The {alpha}-form, space group P2{sub 1}/n, has dimensions: a = 8.589(4) {Angstrom}, b = 27.222(10) {Angstrom}, c = 7.950(4) {Angstrom}, {beta} = 96.92(5){degrees}, Z = 4 and d{sub x} = 1.99 g/cm{sup 3}. The {beta}-form, space group P2{sub 1}/c, has dimensions: a = 13.036(6) {Angstrom}, b = 11.601 (6) {Angstrom}, c = 24.598(10) {Angstrom}, {beta} = 102.90(5) {degrees}, z = 8 and d{sub x} = 2.02 q/cm{sup 3}. The {alpha}-form has one molecule in the asymmetric unit whereas the {beta}-form has two which are chemically equivalent but crystallographically different. The study thus yields three independent determinations of the same molecular structure. Thorium is bonded to the cyclooctatetraene ring, to two chlorine atoms, and to two oxygen atoms from the tetrahydrofuran moieties. Significant distances (averaged) are: Th-Cl = 2.69 {Angstrom}, Th-O = 2.57 {Angstrom}, and Th to plane of C{sub 8}H{sub 8} = 2.02 {Angstrom}

Synthesis and structure of two crystalline forms of (cyclooctatetraene)thorium(IV) dichloride-bis(tetrahydrofuran)