Complexes of Uranyl Nitrate with 2,6-Pyridinedicarboxamides: Synthesis, Crystal Structure, and DFT Study

Abstract

Two complexes of uranyl nitrate with N,N,NЈ, and N,NЈ-diethyl-N,NЈ-diphenyl-2,6-pyridinedicarboxamide (EtPhDPA) were synthesized and studied. The complex of tetraalkyl-2,6-pyridinedicarboxamide with metal nitrate was synthesized for the first time. XRD analysis revealed * Prof. Dr. M. Alyapyshev E-Mail: mikkaly@gmail.com [a] ITMO University 49, Kronverksky pr.

Coordination Structures of the Uranyl(VI)–Diamide Complexes: A Combined Mass Spectrometric, EXAFS Spectroscopic, and Theoretical Study

“…For the UO 2 (TMPDA) 2 2+ complex (Figure c), the uranyl moiety is coordinated by four O carbonyl atoms with a U–O carbonyl distance of 2.482 Å, close to the values (2.38–2.41 Å) in the solid state 1:1 uranyl tetraalkyl­pyridine-2,6-dicarboxamide complex. , The U–N pyridine distance was computed to be 2.781 Å, which is comparable with the U–O ether distance (2.759 Å) of the UO 2 (TMOGA) 2 2+ complex calculated at the same level of theory. The existence of weak interactions between O ether and uranium in UO 2 (TMOGA) 2 2+ is indicative of the presence of similar interactions between uranium and N pyridine in the UO 2 (TMPDA) 2 2+ complex .…”

“…The uranium isotope employed was 238 U, which undergoes α-decay with a half-life of 4.5 × 10 9 years, and handling of α-emitting radionuclide 238 U requires proper shielding, waste disposal, and personal protective gear. The TMGA, TMTDA, and TMPDA ligands were synthesized according to the literature. ,, The ESI and CID experiments were performed using a ThermoScientific (San Jose, CA) LTQ-XL linear ion trap mass spectrometer (LIT-MS) equipped with a Heated Ion Max Electrospray Ionization (HESI) source. ESI mass spectra were acquired in the positive polarity mode, and detailed instrumental parameters are listed in the Supporting Information.…”

“…For UO 2 2+ , the coordination structures of its complexes with a series of neutral diamide ligands in the solid state have been determined using single crystal X-ray diffraction. − The diglycolamides, , dipicolinates, and the corresponding diamides − act as tridentate chelating ligands in the uranyl complexes while glutaramides , and thiodiglycolamides were found to bind the uranium center in bidentate fashions. Compared with the rich studies on the solid state structures of the uranyl–diamide complexes, limited information is available on the structures of these complexes in solution and gas phase.…”

Coordination Chemistry of Actinide Nitrates with Cyclic Amide Derivatives for the Development of the Nuclear Fuel Materials Selective Precipitation (NUMAP) Reprocessing Method

“…As a result, UO 2 (NO 3 ) 2 (L) 2 should exhibit cis‐/trans‐ isomerism in its equatorial plane as shown in Figure . However, the cis ‐form of UO 2 (NO 3 ) 2 (L) 2 in C 2 v symmetry is observed only in few cases in the presence of another multidentate chelating ligand , . In contrast, its trans ‐geometry in higher symmetry ( D 2 h ) seems to be much more preferred.…”

Ion recognition properties of new pyridine-2,6-dicarboxamide bearing propeller-like pendant residues: multi-spectroscopic approach

“…Another important group of molecular receptors constitute pyridine-2,6-dicarboxamides (dipicolinic acid amides) [13] showing among others affinity towards d and f block metal cations [14] and uranyl cations [15]. Wagner-Wysiecka et al [16] described naphthyl-and anthrylpyridine-2,6-dicarboxamides for spectrophotometric and spectrofluorimetric recognition of copper(II) and lead(II) in acetonitrile.…”