A serial of 2D Co‐Zn isomorphous metal–organic frameworks for photodegradation and luminescent detection properties

A series of 2D isomorphous MOFs [M (HBTC)(BMIOPE)·DMF·H 2 O] n (M = Zn ( 1 ), Zn 0.7 Co 0.3 ( 2 ), Zn 0.5 Co 0.5 ( 3 ), Zn 0.3 Co 0.7 ( 4 ), Co ( 5 ), H 3 BTC = 1,3,5‐benzenetricarboxylic acid, BMIOPE = 4,4′‐bis(2‐methylimidazol‐1‐yl)diphenyl ether) were synthesized to investigate the correction between the center metal ions and the photocatalytic behaviors. The photocatalytic results show that with the increase of Co 2+ content, the photodegradation properties are continuously improved from 1 to 5 , which fully indicate that only changing metal ions could regulate the photodegradation properties. In detail, 1 is an inactive photocatalyst to degrade methylene blue (MB), while 5 exhibits preeminent photocatalytic properties under visible light irradiation. Moreover, 1 shows good selective sensing toward Fe 3+ , Cr 3+ , UO 2 2+ , CrO 4 2− and Cr 2 O 7 2− ions in aqueous solution. To the best of our knowledge, 1 is the first MOF example for the optical detection of Fe 3+ , Cr 3+ , UO 2 2+ , CrO 4 2− and Cr 2 O 7 2− ions in aqueous solution.