Synthesis of an advanced metal-guided photochromic system for molecular keypad lock: detailed experimental findings and theoretical understanding

Abstract

The dye-containing Schiff base metal complex is a new member of the photochromic family with advantages, such as long-wavelength absorption, high molar absorption coefficient, quick-photoresponse, and excellent fatigue resistance.

A Brief Review on Advances in Rhodamine B Based Chromic Materials and Their Prospects

“…The group echoed the MG-ESIPT (Figure 24B) (as suggested by Professor Chowdhury et al) as the probable mechanism for the photochromic process. 50 In 2022, Prof. P. Chowdhury's group designed and developed another new metal-guided photochromic system (MG-PCS) based on RhB salicylaldehyde hydrazone Zn− metal complex 51 (Figure 25A and B). All the photochromic properties including photostationary state, fatigue resistance, 48−51,62,64−66 ESIPT may be considered as a four-level photophysical process, as shown in Figure 26.…”

“…All the photochromic properties including photostationary state, fatigue resistance, 48−51,62,64−66 ESIPT may be considered as a four-level photophysical process, as shown in Figure 26. 51 The presence of suitable metal ions (e.g., Zn 2+ ) is essential to display the ESIPT. Thus, the process is known as MG-ESIPT.…”

“…In 2022, the same research group designed an interesting molecular keypad lock (Figure 34) 51 (the proper combination and sequence of input-dependent output) utilizing their synthesized MG-PCS (Figure 25). The device functions logically in terms of chemical and optical properties (Figure 34).…”

“…Among the three, the metal complex-based photochromic materials are very recent. Particularly, RhB-based photochromic metal complexes are very interesting because they give rise to fantastic characteristic properties under the guidance of a coordinating metal. − …”

“…In 2022, Prof. P. Chowdhury’s group designed and developed another new metal-guided photochromic system (MG-PCS) based on RhB salicylaldehyde hydrazone Zn–metal complex (Figure A and B). All the photochromic properties including photostationary state, fatigue resistance, kinetics, and thermodynamics are well explored experimentally.…”