The Modulation of Photoinduced Intermolecular Electron Transfer in Naphthalenediimide-Based Photochromic Coordination Polymers
Year: 2025
Type: article
Abstract: The controllability of photoinduced intermolecular electron transfer (PIET) of coordination polymers (CPs) with photochromic performance is of great significance and continues to present a challenge. Here, two naphthalenediimide (NDI)-based photochromic CPs, [Ca(CENDI)(H 2 O)(DMF)] ( 1 ) and [Ca(CPNDI)(H 2 O) 2 ] ( 2 ) (H 2 CENDI = N, N ′-bis(carboxyethyl)-naphthalenediimide and H 2 CPNDI = N, N ′-bis(carboxypropyl)-naphthalenediimide), were obtained via the integration of H 2 CENDI/H 2 CPNDI with Ca 2+ ions, respectively. Interestingly, structural transformation of a single crystal was realized (i.e., a two-dimensional layer for 1 versus a three-dimensional open framework for 2 ) by the increase of length of side chain amino acid groups (β-alanine for 1 versus γ-amino butyric acid for 2 ), which indicates that N -substituents can effectively regulate the single-crystal structures. Meanwhile, 1 and 2 display entirely different photoresponse rate (color transformation time: all are 1 s, Δ abs: 0.30 for 1 versus 0.13 for 2, coloration saturation time: 7 s for 1 versus 1 min for 2 ), indicating that the PIET process could also be effectively regulated by varying the N -substituents. Notably, an effective and easy method for regulating the PIET behaviors of CPs has been developed in this paper, paving the way for the construction of controllable functional materials.
Source: Inorganic Chemistry
Institutions: Yuncheng University, Shanxi Normal University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Award: G1851103949
OpenAlex ID: W4411113707