Molecular Engineering of Ionic Metal-Organic Frameworks via Ligand Conjugation Modulation for Tailored Phosphorescence and Multilevel Encryption.

ABSTRACT: The rational design of metal-organic frameworks (MOFs) with tunable phosphorescence remains challenging due to limited understanding of ligand conjugation effects on excited-state dynamics. Herein, two isomorphic ionic MOFs (IMOF-DMF and IMOF-DEF) are constructed via in situ decarbonylation of DMF/DEF, leveraging guest-ion size to regulate ligand conjugation through modulation of pyridine ring dihedral angles. IMOF-DEF exhibits superior room-temperature phosphorescence (RTP) and temperature-dependent behavior. Mechanistic studies reveal that reduced conjugation enhances intersystem crossing (ISC) by strengthening spin-orbit coupling while minimizing the singlet-triplet energy gap (ΔE_st). Furthermore, a dual-parameter anti-counterfeiting platform and flexible PVA hydrogel films e

SUBMITTER: Wu Q 

PROVIDER: S-EPMC12533150 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature