Two Series of Novel Rare Earth Complexes with Dicyanamide [Ln(dca)<sub>2</sub>(phen)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>][dca]·(phen), (Ln = Pr, Gd, and Sm) and [Ln(dca)<sub>3</sub>(2,2‘-bipy)<sub>2</sub>(H<sub>2</sub>O)]<i><sub>n</sub></i>, (Ln = Gd, Sm, and La): Syntheses, Crystal Structures, and Magnetic Properties
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Two series of novel complexes, [Ln(dca)2(Phen)2(H2O)3](dca)·(phen) (Ln = Pr (1), Gd (2), and Sm (3), dca = N(CN)-, phen = 1,10-phenanthroline) and [Ln(dca)3(2,2‘-bipy)2(H2O)]n, (Ln = Gd (4), Sm (5), and La (6), 2,2‘-bipy = 2,2‘-bipydine), have been synthesized and structurally characterized by X-ray crystallography. The crystal structures of the first series (1−3) are isomorphous and consist of discrete [Ln(dca)2(Phen)2(H2O)3]+ cations, dca anions, and lattice phen molecules; whereas the structures of the second series (4−6) are characterized by infinite chains [Ln(dca)3(2,2‘-bipy)2(H2O)]n. The Ln(III) atoms in all complexes are nine-coordinated and form a distorted tricapped trigonal prism environment. The three-dimensional frameworks of 1−6 are constructed by intermolecular hydrogen bond interactions. Variable-temperature magnetic susceptibility measurements for complexes 1, 2, 4, and 5 indicate a Curie−Weiss paramagnetic behavior over 5−300 K.
