Abstract
Summary PCM-22, a metal-organic framework material comprising triphenylphosphine and Ln 3+ ions (Ln = Pr–Yb), exhibits solid-state luminescence at room temperature. Mixed-metal versions of PCM-22 that contain controlled amounts of Eu 3+ , Gd 3+ , and Tb 3+ function as highly sensitive, broad-scope solid-state sensors that can rapidly identify unknown solvents by providing a unique eight-factor fingerprint. The sensors allow for immediate solvent identification via color changes that are obvious to the naked eye and also permit quantitative chemical analysis by uncomplicated spectrophotometry. These same materials achieve quantitative detection of H 2 O in D 2 O from 10 to 120,000 ppm. The detection of trace H 2 O is also demonstrated in a range of common solvents, including those incompatible with conventional laboratory titration methods.
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