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Simpler is better: A heterometallic (Mn-Na) metal organic framework (MOF) with a rare myc topology synthesized from bench chemicals for selective adsorption and separation of organic dyes

The present work summarizes the design of a new heterometallic (Mn-Na) metal organic framework (MOF) synthesized under solvothermal conditions. The single crystal X-ray analysis uncovers its composition as [MnNa(HCOO)3]n. The crystallography reveals the presence of two metal ions in the asymmetric unit i.e., Mn and Na which are connected through a bridging formate ligand. Both Mn(II) and Na(I) are coordinated by six oxygen atoms thus forming a distorted octahedral geometry around each metal ion. The HCOO? ligand acts as a bridge to propagate the structure along the three axis resulting in a 3D MOF. Each oxygen of the formate is coordinated to both Mn and Na. Topological analysis shows a rare myc topology of the MOF which is very uncommon among the coordination polymers reported so far. The resulting Mn-Na shows excellent selectivity, in the aqueous phase, for adsorption and separation of cationic dye, methylene blue (MB) with an adsorption capacity to be 46.22?mg?g?1. Moreover, this adsorbent material showed excellent structural stability and recyclability; and the pseudo-second-order kinetics for adsorption. The plausible mechanism suggests that the HSAB concept is responsible for the adsorption process. Hard donors of dye molecules build strong interactions with hard Na+ ions embedded in MOF. Thus, the designed MOF is the first example in heterometallic MOF chemistry to show dye adsorption and is established as a simple, easy to prepare and low-cost polymer for environmental protection for future endeavours.

» Author: Nazir Ud Din Mir, M. Shahwaz Ahmad, Shabnam Khan, Mohammad Yasir Khan, Farhat Vakil, Shashank Saraswat, M. Shahid

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