The crystal structures of 4,4′-bipyridinium μ-(4,4′-bipyridine)bis[diaquatetranitratoneodymate(III)]-tris(4,4′-bipyridine) and a second monoclinic form of triaquatrinitratoholmium(III) – bis (4,4′-bipyridine) |
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Authors: | Timothy J R Weakley |
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Institution: | Department of Chemistry, Dundee University, Dundee DD1 4HN, U.K. |
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Abstract: | The structures of (4-bipyH)2(μ-4-bipy)Nd2(NO3)8(H2O)4]·3(4-bipy) (4-bipy = 4,4′-bipyridine; P21/c, a = 18.723(10), b = 10.720(6), c = 18.027(10) Å, β = 94.43(5)°, Z = 2; R = 0.066 for 4931 (diffractometer data) and of a second monoclinic form of Ho(NO3)3(H2O)3]·2(4-bipy) (P21/c, a = 15.830(10), b = 21.44(3), c = 15.70(3) Å, β = 100.4(2)°, Z = 8; R = 0.091 for 2335 film data) are reported. In the first compound pairs of Nd atoms are bridged across a crystal inversion centre by a 4-bipy ligand, and 10-coordination is completed by one monodentate NO3, three bidentate NO3, and two H2O ligands, with bond lengths Nd---N 2.70, Nd---OH2(av.) 2.44, Nd---O(NO3, av.) 2.56 Å. The second compound has a variant of the previously-reported monoclinic Y(NO3)3(H2O)3]·2(4-bipy) structure, with doubling of the unit cell on a but with essentially no change in the geometry and orientation of the nine-coordinate complex. In both compounds the non-coordinated, non-protonated 4-bipy N atoms form hydrogen bonds with ligand H2O. |
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