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Crystal structures of two Sm^III complexes with dipicolinate [DPA]^2- ligands: comparison of luminescent properties of products obtained at different pH values.

ABSTRACT: The formation of the two title compounds, Na₃[Sm(DPA)₃]·14H₂O tris-odium tris-(pyridine-2,6-di-carboxyl-ato-κ³ O ²,N,O ⁶)samarate(III) tetra-deca-hydrate, Na₃[Sm(C₇H₃NO₄)₃]·14H₂O, and catena-poly[[[di-aqua-(6-carb-oxy-pyridine-2-carb-oxyl-ato-κ³ O ²,N,O ⁶)samarium(III)]-μ-pyridine-2,6-di-carboxyl-ato-κ⁴ O ²,N,O ⁶:O ²] tetra-hydrate], {[Sm(C₇H₃NO₄)(C₇H₄NO₄)(H₂O)₂]·4H₂O}_n, depends on the pH value adjusted with NaOH solution. In both crystal structures, the coordination spheres of the Sm^III cations were found to be best described by a tricapped trigonal prism (TTP), with a more regular O₆N₃ donor set for Na₃[Sm(DPA)₃]·14H₂O than that of O₇N₂ for [Sm(DPA)(HDPA)(H₂O)₂]·4H₂O. The supra-molecular features of both crystal structures are dominated by O-H⋯O hydrogen bonds between water mol-ecules and the O atoms of the dipicolinato ligands. Samples were made from solutions at pH = 2, pH = 5, pH = 7, and pH = 10, and the crystals present in each sample were ground to a powder. The powder samples were analyzed with powder X-ray diffraction and luminescence spectroscopy. The splitting of the bands in the luminescence spectra recorded on powders at 77 K was observed to vary with the pH.

SUBMITTER: Mortensen SS

PROVIDER: S-EPMC10439428 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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Crystal structures of two SmIII complexes with dipicolinate [DPA]2- ligands: comparison of luminescent properties of products obtained at different pH values.

Mortensen Sabina Svava SS Sørensen Thomas Just TJ

Acta crystallographica. Section E, Crystallographic communications 20230609 Pt 7

The formation of the two title compounds, Na3[Sm(DPA)3]·14H2O tris-odium tris-(pyridine-2,6-di-carboxyl-ato-κ3 O 2,N,O 6)samarate(III) tetra-deca-hydrate, Na3[Sm(C7H3NO4)3]·14H2O, and catena-poly[[[di-aqua-(6-carb-oxy-pyridine-2-carb-oxyl-ato-κ3 O 2,N,O 6)samarium(III)]-μ-pyridine-2,6- ...[more]

PMID: 37601572

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Dataset Information

Crystal structures of two Sm^III complexes with dipicolinate [DPA]^2- ligands: comparison of luminescent properties of products obtained at different pH values.

Publications

Crystal structures of two Sm<sup>III</sup> complexes with dipicolinate [DPA]<sup>2-</sup> ligands: comparison of luminescent properties of products obtained at different pH values.

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