Abstract
Among the numerous halometalates, relatively the organic-inorganic hybrid bromoargentates and their applications in optoelectronics are rarely explored. In this paper, using photosensitive metal complexes as structure-directing agents, a new two-dimensional (2D) microporous bromoargentate hybrid, i.e. [NH4][Fe(bipy)3]2[Ag6Br11] (bipy = 2,2′-bipyridine), has been solvothermally constructed and structurally characterized. Compound, crystallizing in the R 3¯ (No. 148) space group, features a [Ag6Br11]n5n− anionic layer characteristic of regular hexagonal-like windows. It has a narrow band gap (ca. 1.90 eV) and good aqueous/thermal stability, which endowed the title compound with stable and excellent photoelectric switching performances. Under the visible light irradiation, the average photocurrent on/off ratio reached 3.0 μA·cm−2, significantly exceeding those of some metal halide analogues. Also, its sensitivity could be further enhanced when applying a biased potential or exposed to the improved light intensity. The Hirshfeld surface analyses, X-ray photoelectron spectroscopy and theoretical studies of title compound have also been performed.
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