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Nickel bis (dithiolene) complexes are strong sunlight absorbers with high thermal- and photostability and are nonluminescent, resulting in remarkable photothermal properties. Nevertheless, nickel-bis (dithiolene) -based metal–organic frameworks (MOFs) have rarely been reported as photothermal and photocurrent agents. Herein, nickel-bis (dithiolene-dibenzoic acid) Ni (C2S2 (C6H4COOH) 2) 2, as a new functional redox-reversible "non-innocent" metalloligand, was innovatively assembled into two MOFs, Zn2Ni (C2S2 (C6H4COO) 2) 2 (H2O) 2·2DMF and Cd2Ni (C2S2 (C6H4COO) 2) 2 (H2O) 2·2DMF (1 and 2, DMF = N, N-dimethylformamide). Under one-sun illumination (0. 1 W cm–2, 300–2500 nm), the temperature of the MOFs sharply increased to 69. 6 and 69. 3 °C from room temperature in 300 s, concomitant with induced photocurrents of 7. 0 and 6. 5 μA for 1 and 2. The considerable performance is due to charge transfer, as revealed by cyclic voltammetry (CV) and solid-state UV/vis–NIR spectroscopy. This study not only provides insights into the development of photothermal and photoconductivity materials but also paves the way for designing functional materials with appealing applications.
Zhang et al. (Mon,) studied this question.