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[(C6H5CH2C5H4)2GdCl.THF]2 (1) and (C6H5CH2C5H4)2ErCl.THF (2) were prepared by the reaction of LnCl3 (LnGd, Er) with benzylcyclopentadienyl sodium in THF and characterized by elemental analysis, IR, 1H NMR, 13C NMR, MS and thermal gravimetry. The crystal structures of both compounds were determined. Complex 1 is dimeric and its structure belongs to the monoclinic, P21/c space group with a=1.1432(2), b=1.2978(2), c=1.7604(3) nm, β=108.75(2), V=2.4732(9) nm3, Z=2(four monomers), Dc“1.54 g.cm−3. R=0.0342 and Rw“0.0362. Complex 2 is monomer and its structure belongs to the orthorhombic, P212121 space group with a=0.8645(2), b=1.1394(3), c=2.5289(4) nm, V=2.4919(9) nm3, Z=4, Dc“1.56 g.cm−3. R=0.0514, Rw“0.0529. The determination of the crystal structure shows that in complex 1 the benzyl groups on the cyclopentadienyls coordinated to Gd3+ are located in the opposite direction (139°); in complex 2 the benzyl groups on the cyclopentadienyls coordinated to Er3+ are located in the same direction (6.5°).
Chinese Journal of Chemistry – Wiley
Published: Jan 1, 1996
Keywords: ; ; ;
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