Lattice solvent controlled photochromism of tripyridyl-triazine-based zinc bromide complexes

Abstract

The development of new stimuli-responsive materials with controllable properties has been highly desirable in the past decade owing to their increasing application demand in various areas. In this work, two...

Hybrid Inorganic–Organic Complexes of Zn, Cd, and Pb with a Cationic Phenanthro-diimine Ligand

“…From the photophysical viewpoint, it is well known that group 12 metal halides, which are used as starting reagents for the fabrication of halometalate-based hybrids, and the related salts MX 2 (M = Zn, Cd) readily form fluorescent complexes with chelating N- and O-donors (e.g., N-heterocyclic and Schiff bases, salen-type ligands, etc.) adopting 4-, 5-, and 6-coordination numbers. − Coordination of the metal centers may lead to the conformational modification and substantial perturbation of the electronic structure of organic molecules, resulting in, e.g., enhanced intramolecular charge transfer, ,, appearance of stimuli-responsive and sensing ability, ,− ,, suppression of photoinduced electron transfer, and dramatic improvement of quantum efficiency typically accompanied by the bathochromic shift of the emission. ,,,, On the other hand, the coordinated MX 2 units tend to participate in intermolecular noncovalent interactions, which have a strong impact on the solid-state arrangement and the corresponding optical properties. ,, …”

“…36,39,46,47,50 On the other hand, the coordinated MX 2 units tend to participate in intermolecular noncovalent interactions, which have a strong impact on the solid-state arrangement and the corresponding optical properties. 41,42,51 In comparison to zinc and cadmium, the coordination chemistry of main group metals is less developed for the soft N-heterocyclic ligands and is illustrated by pseudo-octahedral complexes of Pb(II), forming 1D polymeric chains [Pb-(diimine)(μ-X) 2 ] n , 52−56 the emission energy of which is regulated by aromatic system. 56 To probe the viability of the concept illustrated in Scheme 1C and to utilize the cationic chromophore ligand in the synthesis of low-dimensional metal hybrids, as a case study, we have chosen easy-to-obtain and -modify phenanthrene fused with the chelating imidazolyl-pyridine motif, which readily coordinates to late transition metals as was earlier shown by us and other groups.…”

“… 36 , 39 , 46 , 47 , 50 On the other hand, the coordinated MX 2 units tend to participate in intermolecular noncovalent interactions, which have a strong impact on the solid-state arrangement and the corresponding optical properties. 41 , 42 , 51 …”

Solvent-Modulated Self-Assembly of Naphthalenediimide-Based Cd(II) Complexes and the Controllable Photochromism via Conformational Isomerization

“…Since the 21st century, optical information functional materials developed with light as the information carrier and combined with optical technology have shown great application potential in optics and electricity and have contributed to improving the quality of human life. − Among them, photochromic functional materials have piqued the interest of scientists because of their practical application value and potential development space in optics, − magnetism, medicine, catalysis, fluorescence, , and so on. Among various photochromic materials, coordination polymers (CPs) photochromic systems based on electron donor–acceptor (D-A) type photo-induced intermolecular electron transfer (ET) have received a lot of attention due to their exceptional photochromic characteristics, such as instantaneous photoresponse, wide photoresponse range, and intense color rendering contrast. − However, the majority of reported ET photochromic materials have photoresponse ranges that are generally in the UV area or X-ray region for higher energy excitations. − Since UV/X-ray light accounts for only a tiny fraction of the total solar energy, the difficulty of obtaining UV/X-ray light in daily life dramatically limits the application of such photochromic materials .…”

Large Room Temperature Magnetization Enhancement in a Copper-Based Photoactive Metal–Organic Framework

“…Photochromism, with reversible color changes in materials under the irradiation of light, has potential applicability in optical switches, data storage, chemical sensors, etc. − Growing interest in this field has expanded the research of syntheses, properties, and multiple responses of these photochromic materials. − Until now, various types of photochromic systems have been achieved based on diarylethenes, spiropyrans, naphthalenediimides, and azo and viologen derivatives involving cis–trans isomerization, ring opening/closing, or electron-transfer mechanisms. − Among them, the representative photochromic viologen derivatives have been widely utilized to construct the electron-transfer photochromic architectures. − However, research on these photochromic materials constructed by new photoactive ligands is still limited. , …”