Syntheses and crystal structures of (η 5-C 5H 5) 3Ln(THF) (Ln = Ce, Er)

• Published in: Journal of organometallic chemistry Vol. 467; no. 1; pp. 75 - 78
• Main Authors: Wenqi, Chen, Guanyang, Lin, Jusong, Xia, Gecheng, Wei, Yin, Zhang, Zhongsheng, Jin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 08.03.1994; Elsevier Science
• Subjects: Cerium; Chemistry; Condensed matter: structure, mechanical and thermal properties; Erbium; Exact sciences and technology; Miscellaneous; Organic chemistry; Organic compounds; Organometalloidal and organometallic compounds; Physics; Preparations and properties; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Cerium; Erbium; Erbium Organic compounds; Ether; Molecular structure; Organic ligand; Erbium III Chlorides; Cerium Organic compounds; Experimental study; X ray diffraction; Tetrahydrofurane; Hapto complex; Lanthanide Complexes; Ammonium Cerium IV Nitrates Mixed; Crystalline structure
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/0022-328X(94)88010-7

Brown crystalline tricyclopentadienyl cerium tetrahydrofuranate (THF) complex (gh 5-C 5H 5) 3Ce(THF) was prepared by the reaction of (NH 4) 2Ce(NO 3) 6 with sodium cyclopentadienide (C 5H 5Na) in THF at molar ratio of 1:6. ErCl 3 · 4THF reacts with potassium cyclooctadienide (C 8H 11K) at − 78°C and then with C 5H 5 Na at room temperature in THF at a molar ratio of 1:1:2 to give pink crystals of (η 5-C 5 H 5) 3Er(THF). The crystal structure determination of both these complexes shows that both belong to monoclinic space group P2 1/ n, but their structures differ in that the Ce complex is not isostructural with (η 5-C 5H 5) 3Ln(THF) (Ln = La, Pr, Nd, Gd, Dy, Y and Lu). However, the Er complex structure is isostructural. There are two discontinuity points at Ce and Dy but no “gadolinium break phenomenon” in the regularity of lanthanide contraction.