Coordination Architectures of Lanthanum Complexes Based on Bifunctional 5‐Substituted Tetrazolecarboxylate Ligands

Abstract

Three complexes of bifunctional 5‐substituted tetrazolatecarboxylate ligands [2‐(5‐(pyrazin‐2‐yl)‐2H‐tetrazol‐2‐yl)acetic acid (Hpztza), 3‐(5‐amino‐2H‐tetrazol‐1(5H)‐yl)propanoic acid (Hatzp), and N,N′‐bis(tetrazol‐5‐yl)anime‐N2,N2′‐diacetic acid (H2datza)], namely a mononuclear structure [La(pztza)2(H2O)5]·4H2O·pztza (1), a 1D polymeric chain structure [La2(atzp)4(H2O)8]·2NO3·2H2O (2), and a 2D layer network [La(datza)(H2O)3]·4H2O (3) were prepared and structurally characterized by elemental analysis, IR spectroscopy, and single‐crystal X‐ray diffraction. The structures of these complexes are controlled not only by the number and different coordination modes of the tetrazole‐carboxylate ligands but also the different 5‐substituents of the tetrazole ring. The complexes show ligand‐centered luminescence at room temperature in the solid state. The obvious enhancements in luminescence make these complexes to be the potential materials for optical use.

A Surface Coordination Interphase Stabilizes a Solid‐State Battery

“…[30] Then ew absorption peaks at 680 nm may be related to the ligand field transition absorption, [31] and the strong absorption in the near-UV region (250-360 nm) can be assigned to the p-p*and n-p*transition of the conjugated C = Ns tructure of the polymerized SCN. [28,32] To further clarify their interaction, the adsorption energy calculation and Bader charge analysis of SCN-adsorbed LLZO were performed by first-principles calculations based on density functional theory (DFT) (Figure 2fand Table S2). Them ost stable La/Li-co-terminated (001) surface of LLZO was used to adsorb SCN.…”

Bifunctional tetrazole–carboxylate ligand based Zn(ii) complexes: synthesis and their excellent potential anticancer properties

“…The disappearance of the strong absorptions at 1702 and 1724 cm −1 corresponding to the ν (–CO) vibrations of –COOH groups confirms the deprotonation of the –COOH groups of the two ligands during the hydrothermal reactions. 36,37 The two complexes show the characteristic asymmetric and symmetric stretching vibrations of the carboxylate groups at 1600, 1623 cm −1 and 1384, 1400 cm −1 , respectively. There were also typical peaks at 3482 and 3437 cm −1 are ascribed to the O–H vibrations of the free or coordinated H 2 O in 1 and 2 .…”

A Surface Coordination Interphase Stabilizes a Solid‐State Battery

“…Meanwhile, the absorption bands at visible regions (400–700 nm) have a remarkable red shift with the increase of SCN content, which can be attributed to the metal‐to‐ligand charge transfer (MLCT) transition of the coordination structure in the LLZO/SCN complexes [30] . The new absorption peaks at 680 nm may be related to the ligand field transition absorption, [31] and the strong absorption in the near‐UV region (250–360 nm) can be assigned to the π‐π* and n‐π* transition of the conjugated C=N structure of the polymerized SCN [28, 32] …”

“…[30] Then ew absorption peaks at 680 nm may be related to the ligand field transition absorption, [31] and the strong absorption in the near-UV region (250-360 nm) can be assigned to the p-p*and n-p*transition of the conjugated C = Ns tructure of the polymerized SCN. [28,32] To further clarify their interaction, the adsorption energy calculation and Bader charge analysis of SCN-adsorbed LLZO were performed by first-principles calculations based on density functional theory (DFT) (Figure 2fand Table S2). Them ost stable La/Li-co-terminated (001) surface of LLZO was used to adsorb SCN.…”