Photoswitchable alkoxy-bridged binuclear rhenium(i) complexes – a potential probe for biomolecules and optical cell imaging

Abstract

Photoswitchable alkoxy-bridged binuclear rhenium(I) complexes -a potential probe for biomolecules and optical cell imaging3

Synthesis and Photophysical Properties of Rhenium(I)-Alkynyl Molecular Rectangles

“…S10). The decay of absorbing triplet excited state is also bi-exponential with a lifetime of 2.44 µs and t 2 = 0.011 µs for 3, which is not in agreement with the emission lifetime of the low energy band in Fig Several studies have reported triplet energy transfer from a metal ion center to an aryl hydrocarbon, [32][33][34][35][36] but, in some cases, the photosystems were unstable with respect to the sensitized oxygenation of the polycycle 36 . Meyer and co-workers 37 reported an intense transient absorption at 450600 nm, which is characteristic of a 4,4'-bpylocalized MLCT excited state in Re(I) complexes.…”

“…S9), we believe that the excited state decay of 2 originates from the different states, i.e., 3 LLCT/ 3 ILCT excited states. The transient absorption (TA) spectrum of 3 exhibits a bleaching of the MLCT absorption in the region from 420 to 480 nm with a maximum at 460 nm during triplet population 32,33 . In addition, this complex shows a broad and much stronger positive absorption at 500-700 nm (Fig.…”

“…1 suggests that they originate from the [dp(Re) → p*(bpy)] and/or [dp(Re) → p*(alkynyl)] 3 MLCT excited states. Laser flash excitation of 2 at 355 nm leads to a structured bleaching of the MLCT absorption in the region from 330 to 430 nm with a maximum at 380 nm during triplet population 32,33 . In addition, this complex showed a broad and much stronger positive absorption at 450-700 nm (Fig.…”

Luminescent sensor for copper(II) ion based on imine functionalized monometallic rhenium(I) complexes

“…[2830], catalysis [31], light-emitting devices [32,33], CO2 fixation [34], optical switches [35,36], bioprobes [37,38] and imaging [39]. As far as we know, there is a limited number of reports available on rhenium(I) complexes attached to the imine ligands [4042].…”

Phosphorescence “Turn‐On” Sensing of Anions by Rhenium(I) Schiff‐Base Complexes

“…Re(I)‐tricarbonyl diimine complexes are one of the most important and widely studied classes of luminescent d 6 transition metal complexes . The rich photophysical and photochemical behavior of the excited state rhenium(I)‐tricarbonyl complexes led to a wide range of interesting and important applications, including their use as sensors,, catalysts, light‐emitting devices, in CO 2 fixation, electron transfer, energy transfer, optical switches,, bioprobes,, and cellular imaging . The combination of photoactive metal center along with ligand is a desirable candidates for sensing anions.…”