Triple responsive room temperature luminescence, photochromism and photomagnetism in a Dy(iii)-based linear chain complex

Abstract

A Dy(III)-based linear chain compound was reported with eye-detectable and reversible photochromic phenomenon under ambient condition. After light irradiation, room temperature luminescence response and photodemagnetization effect were for the first...

From Weak to Strong Antiferromagnetism: Tuning the Magnetic Properties of a Mononuclear Fe3+ Complex via Electron Transfer Photochromism

“…To confirm the above photochromic phenomenon, the time-resolved UV–vis spectra of compound 1 were recorded at the solid state upon light irradiation. As shown in Figure b, with the duration of the xenon lamp, new absorption peaks centered at 550 and 750 nm appeared and became stronger in intensities, similar to other photochromic complexes containing the TPB ligands and implying the generation of H 3 -TPB • radicals. − To estimate the rate of photochromism, the kinetics of the coloration for 1 was analyzed by transforming the UV–vis absorption spectra as diffuse-reflectance ones (Figure S3), and the function R λmax ( t ) = a /( bt + 1) + R λmax ( ∞ ) was used to fit the peak of diffuse reflection versus time. − The relative parameters are listed in Figure c, wherein the constants a and b are the fitting results and R λmax ( ∞ ) is the peak value of the diffuse reflection spectrum after complete irradiation. The half-time t 1/2 is estimated as 4.29 s, exhibiting very fast coloration during irradiation.…”

“…As shown in Figure d, broad emissions from 340 to 550 nm appeared when the powder samples were illuminated by 270 nm UV light, which should be ascribed to the H 3 -TPB ligands. As the time of illumination increased, the emission intensities clearly decreased till they reached the lowest point at about 80 min, suggesting that H 3 -TPB ligands gradually converted to radical species and led to fluorescence quenching. ,,, However, the intensities in the main PXRD peaks decreased after light irradiation, indicating that photodecomposition may also occur in compound 1 besides the photogeneration of radicals (Figure S2). , Notably, the TG curve of 1a showed a slightly less weight loss than that before irradiation, also suggesting the decomposition after light irradiation (Figure S1).…”

Decorating Metal Nitrate with a Coplanar Bipyridine Moiety: A Simple and General Method for Fabricating Photochromic Complexes

“…In parallel to photodeformable and photoresponsive units, nonphotochromic conjugated N‐heterocycle derivatives as potential π‐electron acceptors (π‐EAs) have also become promising candidates to produce CHPMs [33–54] . We and others have verified that the electron‐transfer (ET) strategy is paramount to yield CHPMs supported by conjugated N‐heterocycle derivatives.…”

“…For example, linear dipyridine species have been introduced into various metal–ED systems (ED=chloride, carboxylate, phosphite) to fabricate a series of ET‐based CHPMs [33–43] . The assembly of tripyridine species such as 2,4,6‐tris(4‐pyridyl)‐1,3,5‐triazine with different ED units varying from inorganic phosphite and chloride to organic carboxylate and diphosphonate in the presence of suitable metal ions generates a series of CHPMs exhibiting fascinating photoresponsive functionality [44–54] …”

A Cu2I2-Based Coordination Framework as the Selective Sensor for Ag+ and the Effective Adsorbent for I2

“…Metal–organic frameworks (MOFs), which are deemed as a family of functional inorganic–organic hybrids, display multiple physicochemical properties in luminescence sensing, sorption/separation, pollutant treatment, and so on. − The combination of metal nodes with various types of organic linkers could provide a great ability to afford functional solids with diverse architectures and even unexpected applications. To construct these promising MOF-based sensors or adsorbents, the employment of metal-based clusters as secondary building units (SBUs) is considered to be an effective way for the acquisition of desirable products. − By virtue of the tailorable compositions and tunable sizes in SBUs, diverse structural forms and plenty types of electronic transfers could be realized in the resultant coordination compounds.…”