Syntheses, Crystal Structures, Thermal and Photoluminescent Properties of Four Coordination Complexes with a Hetero­cyclic Thioether Carboxylate Ligand

Abstract

A series of transition metal coordination complexes, {[Cu(3‐Sptta)2]·1/2H2O}n (1), {[Cd(3‐Sptta)2]·1/2H2O}n (2), [Zn(3‐Sptta)2(H2O)4] (3), and [Co(3‐Sptta)2(H2O)4] (4) were synthesized under solvothermal and solvent evaporation conditions using the newly designed heterocyclic N/NS carboxylate ligand [2‐(3‐pyridyl)‐1,3,4‐thiadiazole‐5‐]‐thio‐acetate (3‐Sptta) as a main building block. Their structures were determined by single‐crystal X‐ray diffraction analyses and further characterized by elemental analyses and IR spectroscopy. The four complexes exhibit structural diversity: complexes 1 and 2 exhibit similar 2D “wave‐like” double‐layer framework with two shares of mutually parallel left‐handed and right‐handed helical chains, whereas 3 and 4 present mononuclear structures. Moreover, the thermal stabilities of complexes 1–4 were investigated. The luminescent properties of complexes 2, 3 and the free ligand were also studied.

Functionalization of 2-Mercapto-5-methyl-1,3,4-thiadiazole: 2-(ω-Haloalkylthio) Thiadiazoles vs. Symmetrical Bis-Thiadiazoles

“…The functionalisation of 2-mercapto-5-methyl-1,3,4-thiadiazole (1) with α,ωdihalogenoalkanes was performed by applying the one-step procedure shown in Scheme Sulphur-containing ligands, on the other hand, have shown remarkable coordination properties [54][55][56][57][58][59][60][61] and have displayed a wide range of applications [62][63][64][65][66][67][68]. Among them, heterocyclic thioethers have exhibited a broad spectrum of bioactivities [69][70][71][72] and efficiency as adsorbents for lead ion removal from water [73], ligands in N-heterocyclic carbene (NHC) complexes [74][75][76][77], metal-organic frame-works [78][79][80][81][82], etc. As a very particular example, it is shown that symmetrical bis-1,3,4-thiadiazole-containing bis-thioethers tune the framework formation of silver(I) coordination architectures [83].…”

Eu3+- and Tb3+-Dipicolinate Complexes Covalently Grafted into Kaolinite as Luminescence-Functionalized Clay Hybrid Materials

“…Lanthanide-pyridinecarboxylic (picolinic) acid complexes are important to develop advanced luminescent materials with applications in photoelectronics, laser, luminescence labels, fluorescent probes, luminescence sensors, light-conversion molecular devices (LCMDs), organic light-emitting devices (OLEDs), fluorescent lamps, and cathode-ray tubes as well as plasma display panels (PDPs). − Lanthanide-aromatic carboxylate complexes display interesting photophysical properties due to the antenna effect; that is, the organic ligand in the complex absorbs energy more intensely than the isolated organic ligand . However, these complexes exhibit low thermal and chemical stabilities.…”