Structural Variety of Cobalt(II), Nickel(II), Zinc(II), and Cadmium(II) Complexes with 4,4′‐Azopyridine: Synthesis, Structure and Luminescence Properties

Abstract

Self-assembled bi- and polymetallic complexes of Co(II), Ni(II), Zn(II), and Cd(II) were obtained by the reaction of 4,4'-azopyridine (azpy) with metal tri-tert-butoxysilanethiolates (Co, 1; Cd, 2), acetylacetonates (Ni, 3; Zn, 4), and acetates (Cd, 5). All compounds were characterized by single-crystal X-ray structure analysis, elemental analysis, FTIR spectroscopy, and thermogravimetry. Complexes 1, 2 and 4, 5 exhibit diverse structural conformations: 1 is bimetallic, 2 and 4 are 1D coordination polymers, and 5 is a 2D coordination framework formed from bimetallic units. The obtained complexes contain metal atoms bridged by a molecule of azpy. The luminescent properties of 1-5 were investigated in the solid state.

Catalytic Application of Tactically Aligned Cd(II)‐Based Luminescent 3D‐Supramolecular Networks

“…To the best of our knowledge, so far Cd–CPs have not been investigated for nitro to amine catalytic reduction and this is for the first time we report the use of D‐glucose as the H‐source for the aforementioned reaction under base‐free conditions at RT. The similar state of the art materials and others such as nanoparticles, composites and doped materials were compared with 1 for the sake of the progress of the reported procedure (Table ) . By careful reading of the table, one can easily identify the reduction of nitro to amine utilized drastic conditions such as synthesis of the catalyst, use of noble metals or expansive metals, harsh H‐source such as explosive H 2 or NaBH 4 , hydrazine hydrate, silanes, formats etc.…”

“…The UV‐vis absorption and emission spectra of compound 1 were determined in the solid state under ambient conditions (Figure ). The absorption spectra of compound 1 in the UV/Vis region show two high‐energy bands at 280 nm and 350 nm are attributed to π⋅⋅⋅⋅π* intra‐ligand transitions …”

Photomechanical Molecular Crystals of an Azopyridine Derivative and Its Zinc(II) Complex: Synthesis, Crystallization and Photoinduced Motion

“…This small change in composition seldom affects the topological space, leading to similar photoisomerization of azopyridine derivatives in comparison to azobenzene compounds [33]. In addition, the introduction of the nitrogen atom enriches the properties of azopyridine derivatives with the possibility to self-assemble with halogen [34], inorganic acid [35], organic acid [36] and metal [37]. So far, investigations on azopyridine derivatives were mainly focused on the synthesis of polymer fibers [38], liquid-crystalline elastomers [36], photoresponsive liquid crystals [34] and luminescent complexes [37].…”

Novel tetrahedral cobalt(ii) silanethiolates: structures and magnetism

“…Our research group has signicant experience in syntheses of tetrahedral cobalt(II) silanethiolates that show noticeable resistance towards hydrolysis. [15][16][17][18][19][20][21] Moreover, our previous research has demonstrated that some of them exhibit high responsiveness in single-ion magnetic anisotropy to even small changes in coordination environments around Co(II) ions. 22 The results obtained so far motivated us to further explore this subject for the purpose of nding the relationship between the coordination arrangement on Co(II) and its magnetic properties.…”