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Open AccessArticle

Molecular and Polymer Ln2M2 (Ln = Eu, Gd, Tb, Dy; M = Zn, Cd) Complexes with Pentafluorobenzoate Anions: The Role of Temperature and Stacking Effects in the Structure; Magnetic and Luminescent Properties

1
N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
2
P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
3
Faculty of Fundamental Sciences, Bauman Moscow State Technical University, 105005 Moscow, Russia
4
Academic Department of Innovational Materials and Technologies Chemistry, Plekhanov Russian University of Economics, 117997 Moscow, Russia
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5689; https://doi.org/10.3390/ma13245689
Received: 12 November 2020 / Revised: 7 December 2020 / Accepted: 8 December 2020 / Published: 13 December 2020
Varying the temperature of the reaction of [{Cd(pfb)(H2O)4}+n·n(pfb)], [Ln2(pfb)6(H2O)8]·H2O (Hpfb = pentafluorobenzoic acid), and 1,10-phenanthroline (phen) in MeCN followed by crystallization resulted in the isolation of two type of products: 1D-polymers [LnCd(pfb)5(phen)]n·1.5nMeCN (Ln = Eu (I), Gd (II), Tb (III), Dy (IV)) which were isolated at 25 °C, and molecular compounds [Tb2Cd2(pfb)10(phen)2] (V) formed at 75 °C. The transition from a molecular to a polymer structure becomes possible because of intra- and intermolecular interactions between the aromatic cycles of phen and pfb from neighboring tetranuclear Ln2Cd2 fragments. Replacement of cadmium with zinc in the reaction resulted in molecular compounds Ln2Zn2 [Ln2Zn2(pfb)10(phen)2]·4MeCN (Ln = Eu (VI), Tb (VIII), Dy (IX)) and [Gd2Zn2(pfb)10(H2O)2(phen)2]·4MeCN (VII). A new molecular EuCd complex [Eu2Cd2(pfb)10(phen)4]·4MeCN (X)] was isolated from a mixture of cadmium, zinc, and europium pentafluorobenzoates (Cd:Zn:Ln = 1:1:2). Complexes II-IV, VII and IX exhibit magnetic relaxation at liquid helium temperatures in nonzero magnetic fields. Luminescent studies revealed a bright luminescence of complexes with europium(III) and terbium(III) ions. View Full-Text
Keywords: cadmium-lanthanide(III) complexes; zinc-lanthanide(III) complexes; pentafluorobenzoic acid; coordination polymer; single crystal X-ray; magnetochemistry; photoluminescence cadmium-lanthanide(III) complexes; zinc-lanthanide(III) complexes; pentafluorobenzoic acid; coordination polymer; single crystal X-ray; magnetochemistry; photoluminescence
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MDPI and ACS Style

Shmelev, M.A.; Kiskin, M.A.; Voronina, J.K.; Babeshkin, K.A.; Efimov, N.N.; Varaksina, E.A.; Korshunov, V.M.; Taydakov, I.V.; Gogoleva, N.V.; Sidorov, A.A.; Eremenko, I.L. Molecular and Polymer Ln2M2 (Ln = Eu, Gd, Tb, Dy; M = Zn, Cd) Complexes with Pentafluorobenzoate Anions: The Role of Temperature and Stacking Effects in the Structure; Magnetic and Luminescent Properties. Materials 2020, 13, 5689. https://doi.org/10.3390/ma13245689

AMA Style

Shmelev MA, Kiskin MA, Voronina JK, Babeshkin KA, Efimov NN, Varaksina EA, Korshunov VM, Taydakov IV, Gogoleva NV, Sidorov AA, Eremenko IL. Molecular and Polymer Ln2M2 (Ln = Eu, Gd, Tb, Dy; M = Zn, Cd) Complexes with Pentafluorobenzoate Anions: The Role of Temperature and Stacking Effects in the Structure; Magnetic and Luminescent Properties. Materials. 2020; 13(24):5689. https://doi.org/10.3390/ma13245689

Chicago/Turabian Style

Shmelev, Maxim A.; Kiskin, Mikhail A.; Voronina, Julia K.; Babeshkin, Konstantin A.; Efimov, Nikolay N.; Varaksina, Evgenia A.; Korshunov, Vladislav M.; Taydakov, Ilya V.; Gogoleva, Natalia V.; Sidorov, Alexey A.; Eremenko, Igor L. 2020. "Molecular and Polymer Ln2M2 (Ln = Eu, Gd, Tb, Dy; M = Zn, Cd) Complexes with Pentafluorobenzoate Anions: The Role of Temperature and Stacking Effects in the Structure; Magnetic and Luminescent Properties" Materials 13, no. 24: 5689. https://doi.org/10.3390/ma13245689

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