Two diverse temperature-directed cobalt-based coordination polymers: environmentally friendly photocatalysts for degrada
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Two diverse temperature‑directed cobalt‑based coordination polymers: environmentally friendly photocatalysts for degradation of organic dyes Xue Lu1 · Xiu‑Li Wang1 · Guo‑Cheng Liu1 · Zheng Bi1 · Ying Su1 Received: 13 March 2020 / Accepted: 15 September 2020 © Springer Nature Switzerland AG 2020
Abstract Two new cobalt-based coordination polymers (CPs) based on a semirigid naphthalene-bridged bis-pyridyl-bis-amide ligand, namely [Co(4-bmnpd)(5-HNIP)2(H2O)2] (1) and [Co4(4-bmnpd)4(5-NIP)4]·2H2O (2) (4-bmnpd = N,N′-bis(4methylenepyridin-4-yl)-2,6-naphthalenedicarboxamide, 5-H2NIP = 5-nitroisophthalic acid), have been prepared under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction analyses, infrared (IR) spectroscopy, and powder X-ray diffraction (PXRD). The structural analyses show that 1 has a one-dimensional (1D) chain structure while 2 exhibits a two-dimensional (2D) network. The effect of temperature on the structures of the CPs is discussed. The solidstate fluorescent properties of 1 and 2 were determined at room temperature. Furthermore, their photocatalytic degradation properties were also studied. Photocatalysts 1 and 2 are environmentally friendly and can effectively degrade organic dye Congo Red (CR) under ultraviolet (UV) light. In addition, the possible degradation mechanism was also investigated.
Introduction The treatment of organic pollutants, especially toxic and refractory organic dye pollutants, in water has always been a very important research topic in the field of chemistry [1–3]. Many inorganic catalysts can effectively degrade various organic pollutants to degradable or less toxic organic compounds. However, most of them are difficult to separate and agglomerate easily, thus limiting their large-scale application [4, 5]. In recent decades, coordination polymers (CPs) as organic–inorganic hybrid materials have received extensive attention, due to their good stability and high recoverability from aqueous solution, being able to effectively degrade organic dyes in water [6–15]. In general, the structure of CPs affects their applications, while the final structure is influenced by the metal, ligand, temperature, pH, and other Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11243-020-00426-4) contains supplementary material, which is available to authorized users.
factors [16–24]. The selection of organic ligands is very important for the assembly of functional CPs with satisfactory structure. As a class of excellent organic ligands, bispyridyl-bis-amide derivatives have received extensive attention in recent years due to their diverse coordination sites, strong coordination ability, and abundant potential hydrogen-bond sites [25–31]. In addition, temperature also has an important influence on the final structure of CPs [32–34]. In this work, we selected the semirigid naphthalenebridged bis-pyridyl-bis-amide N,N′-bis(4-methylenepyridin4-yl)-2,6-naphthalenedicarboxamide (4-bmnpd) as the organic main liga
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