Synthesis, crystal structure, and luminescent properties of metal complexes bearing 2,6-pyridine-diacylhydrazide ligands: supramolecular assemblies via intermolecular interactions

Abstract

Four metal complexes of N,N 0 -bis(salicyl)-2,6-pyridine-dicarbohydrazide 4 ]ÁDMFÁH 2 O (4), were synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. Structural studies revealed that complexes 1-3 present discrete mononuclear structures and complex 4 displays a centrosymmetric mixedvalence trinuclear structure. All four complexes are further extended into interesting two-or three-dimensional supramolecular frameworks. The luminescent properties of 2 and 3 were studied, which show emissions with maxima at 485 nm upon excitation at 396 nm for 2 and 476 nm upon excitation at 397 nm for 3, respectively.

Structure Types and Magnetic Behavior of Cobalt Nanoclusters

“…N -Acylsalicylhydrazides are ideal ligands for the synthesis of novel polynuclear metal complexes due to their multiple N,O atoms with strong coordination ability, abundant hydrogen-bond donors, acceptors, and large conjugation systems. , In addition, the N -acylsalicylhydrazide metal macrocyclic compounds are no longer limited to the trivalent metal ions as monosalicylhydrazide ligands. Moreover, in their macrocyclic compounds, there are more abundant cyclization modes; besides [M–N–N–M] repeat units, they can also be used to form rings …”