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Syntheses and crystal structures of two samarium(III) complexes with bio-relevant ligands

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Under hydrothermal conditions, Sm2O3 reacted with ciprofloxacin (Cip), oxalic acid (Ox) and KOH to give a 2D coordination polymer with the empirical formula of [Sm(Cip)(Ox)1.5] · H2O (1). Sm(ClO4)3 · 6H2O reacted with 3,5-dinitrobenzoic acid (dnb) and 1,10-phenanthroline(phen) to afford dimeric Sm(III) complex, [Sm2(Dnb)6(phen)2] (2). X-ray diffraction analyses show that 1 crystallizes in the monoclinic system, C2/c space group, a = 28.279(3), b = 10.4514(8), c = 16.398(2) Å,  = 114.053°, V = 4425.8(7) Å3, Z = 8, Dc = 1.896 Mg m-3, in which the network of SmO8 and oxalate units form an extended two-dimensional layered structure through tetradentate oxalates, the chelated ciprofloxacin alternatively pointed up and down from the 2D plane, and a 3D lamellar structure is formed via strong intermolecular hydrogen bonds of N-H · O and O-H · O; 2 crystallizes in the triclinic system, P [image omitted] space group, a = 12.063(3), b = 12.967(3), c = 13.260(3) Å, α = 104.046(4),  = 113.750(4),  = 100.391(5)°, V = 1749.0(8) Å3, Z = 2, Dc = 1.830 Mg m-3, in which the molecular unit is a dimer with an inversion center and each Sm(III) adopts a nine-coordinate distorted tricapped trigonal-prism geometry defined by an N2O7 donor set from one phen and five 3,5-dinitrobenzoato ligands.
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Keywords: 1,10-Phenanthroline; 3,5-Dinitrobenzoic acid; Ciprofloxacin; Coordination polymer; Crystal structure; Oxalate; Samarium(III)

Document Type: Research Article

Affiliations: 1: The Key Laboratory of Medicinal Chemical Resources and Molecular Engineering (Ministry of Education), School of Chemistry & Chemical Engineering, Guangxi Normal University, Guilin 541004, P.R. China 2: X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia 3: School of Chemistry & Chemical Engineering of Suzhou University, Suzhou 215006, P.R. China

Publication date: January 1, 2007

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