Field-Induced Single Molecular Magnetism and Photoluminescence in Rare Cocrystals of Isomorphic Lanthanide(III) Coordination Compounds with Fully Substituted Pyridine-4-carboxamide Ligand

Abstract

A series of four isomorphous, 1:2 (Complex :L) rare cocrystals of coordination compounds of Ln(III) ions as [Ln(L)(NO 3 ) 3 (H 2 O)] 2 [L] 2 (Ln(III) = Gd (1), Tb (2), Dy (3) and Ho (4)), were synthesized with N, N-diisobutylisonicotinamide (L) using metal-to-ligand ratio of 1:1. All compounds are dimeric in nature with two co-crystallised L molecules centro-symmetrically interspersed between two dimeric units with H bonded bridges between them to form interesting, self-assembled H-bonded tapes along the c axis. Detailed Shape analysis and Hirshfeld analysis are done to demonstrate geometry around the metal centres and various non-covalent interactions present in the systems, respectively. Magnetic studies show that compound 3 is a field-induced Single-Molecule Magnet (SMM) for which the magnetization relaxes through a combination of Orbach ( = 51 K and  0 = 3.1 x10 -7 s) and Raman mechanisms. Solid state luminescence studies reveal that compounds 1, 2 and 3 are photoluminescent in the visible range while 4 exhibits luminescence in the NIR region. Compound 3 shows cold white light emission with CIE (International Commission on Illumination) coordinates (0.31, 0.30

Synthesis, Characterization and Single Crystal X–ray Crystallography of Nd(III) and Pr(III) Complexes with the Tridentate Schiff Base Ligand N'–(1–(pyridin–2–yl)ethylidene)nicotinohydrazide

“…The polyfunctional acyclic and asymmetric ligands and their complexes represent an essential component of coordination chemistry [1][2][3][4][5][6][7][8][9]. These ligands are largely used for the synthesis of complexes with biochemical and physical properties [10][11][12][13].…”

Recent Advances of Near-Infrared (NIR) Emissive Metal Complexes Bridged by Ligands with N- and/or O-Donor Sites

“…Consequently, bridged coordination compounds have become one of the most active research hotspots in coordination chemistry and have shown extensive applications in the fields of light, electricity, magnetism, catalysis, etc. [8][9][10][11][12][13]. In this review, we mainly focus on the research of near-infrared (NIR) emissive metal complexes with bridging ligands in the last decade.…”

Different Phenomena in Magnetic/Electrical Properties of Co(II) and Ni(II) Isomorphous MOFs

“…The polycarboxylate ligands attract the attention of researchers in the assembly of magnetic MOFs not only due to their variable coordination modes but also due to their ability of magnetic exchange with paramagnetic metal centers . A large number of MOFs with different dimensions and various topologies based on polycarboxylate ligands have been reported in the literature. , The diversity of these materials provides a wonderful opportunity to further understand the basic magnetic phenomenon. Furthermore, the polycarboxylate ligands can easily form multinuclear cluster units with paramagnetic metal centers.…”

“…15 A large number of MOFs with different dimensions and various topologies based on polycarboxylate ligands have been reported in the literature. 16,17 The diversity of these materials provides a wonderful opportunity to further understand the basic magnetic phenomenon. Furthermore, the polycarboxylate ligands can easily form multinuclear cluster units with paramagnetic metal centers.…”