Effect of Non-Covalent Interactions on the 2,4-and 3,5-Dinitrobenzoate Eu-Cd Complex Structures

• Main Authors: Chistyakov, A.S (Author), Dolgushin, F.M (Author), Eremenko, I.L (Author), Gogoleva, N.V (Author), Kiskin, M.A (Author), Kovalev, V.V (Author), Razgonyaeva, G.A (Author), Shmelev, M.A (Author), Sidorov, A.A (Author), Voronina, J.K (Author)
• Format: Article
• Language: English
• Published: MDPI 2022
• Subjects: 2,4-dinitrobenzoic acid; 3,5-dinitrobenzoic acid; cadmium-lanthanide(III) complexes; coordination polymer; non-covalent interactions; single crystal X-ray; thermogravimetric analysis
• Online Access: View Fulltext in Publisher

 Heterometallic {Eu2Cd2} complexes [Eu2 (NO3)2Cd2 (Phen)2 (2,4-Nbz)8]n·2nMeCN (I) and [Eu2(MeCN)2Cd2(Phen)2(3,5-Nbz)10] (II) with the 2,4-dinitrobenzoate (2,4-Nbz) and 3,5-dinitrobenzoate (3,5-Nbz) anions and 1,10-phenanthroline were synthesized. The compounds obtained were characterized by X-ray single-crystal analysis, powder X-ray diffraction analysis, IR spectroscopy, and elemental analysis. Moreover, the thermal stability of the complexes was also studied. Analysis of the crystal packing showed that where 1,10-phenanthroline is combined with various isomers of dinitrobenzoate anions, different arrangements of non-covalent interactions are observed in the complex structures. In the case of the compound with the 2,4-dinitrobenzoate anion, these interactions lead to a significant distortion of the metal core geometry and formation of a polymeric structure, while the complex with the 3,5-dinitrobenzoate anion has a structure that is typical of similar systems. The absence of europium metal-centered luminescence at 270 nm wavelength was shown. For all the reported compounds, a thermal stability study was carried out that showed that the compounds decomposed with a significant thermal effect. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.