Crystal structures of two SmIII complexes with dipicolinate [DPA]2- ligands: comparison of luminescent properties of products obtained at different pH values
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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; Sørensen, Thomas Just.
I: Acta Crystallographica Section E: Crystallographic Communications, Bind 79, 2023, s. 619-625.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Crystal structures of two SmIII complexes with dipicolinate [DPA]2- ligands
T2 - comparison of luminescent properties of products obtained at different pH values
AU - Mortensen, Sabina Svava
AU - Sørensen, Thomas Just
N1 - Publisher Copyright: © 2023 International Union of Crystallography. All rights reserved.
PY - 2023
Y1 - 2023
N2 - The formation of the two title compounds, Na3[Sm(DPA)3]·14H2O trisodium tris(pyridine-2,6-dicarboxylato-κ3 O 2,N,O 6)samarate(III) tetradecahydrate, Na3[Sm(C7H3NO4)3]·14H2O, and catena-poly[[[diaqua(6-carboxypyridine-2-carboxylato-κ3 O 2,N,O 6)samarium(III)]-μ-pyridine-2,6-dicarboxylato-κ4 O 2,N,O 6:O 2] tetrahydrate], {[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 SmIII 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 supramolecular features of both crystal structures are dominated by O - H⋯O hydrogen bonds between water molecules 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.
AB - The formation of the two title compounds, Na3[Sm(DPA)3]·14H2O trisodium tris(pyridine-2,6-dicarboxylato-κ3 O 2,N,O 6)samarate(III) tetradecahydrate, Na3[Sm(C7H3NO4)3]·14H2O, and catena-poly[[[diaqua(6-carboxypyridine-2-carboxylato-κ3 O 2,N,O 6)samarium(III)]-μ-pyridine-2,6-dicarboxylato-κ4 O 2,N,O 6:O 2] tetrahydrate], {[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 SmIII 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 supramolecular features of both crystal structures are dominated by O - H⋯O hydrogen bonds between water molecules 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.
KW - crystal structure
KW - hydrogen bonding
KW - luminescence
KW - PXRD
KW - samarium(III)
U2 - 10.1107/S2056989023004814
DO - 10.1107/S2056989023004814
M3 - Journal article
C2 - 37601572
AN - SCOPUS:85169510783
VL - 79
SP - 619
EP - 625
JO - Acta Crystallographica Section E: Crystallographic Communications
JF - Acta Crystallographica Section E: Crystallographic Communications
SN - 1600-5368
ER -
ID: 371561769