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

A low cost heterometallic (Mn-Na) coordination polymer with rare myc topology is designed and exploited for cationic dye adsorption selectivity and separation. [Display omitted] •A low cost new heterometallic (Mn-Na) metal organic framework (MOF) is synthesized.•The crystallography reveals presence...

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Bibliographic Details
Published in:	Inorganic chemistry communications Vol. 146; p. 110046
Main Authors:	Din Mir, Nazir Ud, Shahwaz Ahmad, M., Khan, Shabnam, Yasir Khan, Mohammad, Vakil, Farhat, Saraswat, Shashank, Shahid, M.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-12-2022
Subjects:	Crystallography Dye adsorption and separation Heterometallic MOF Kinetics Myc topology Wastewater treatment Heterometallic MOF Kinetics Crystallography Myc topology Dye adsorption and separation Wastewater treatment
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Summary:	A low cost heterometallic (Mn-Na) coordination polymer with rare myc topology is designed and exploited for cationic dye adsorption selectivity and separation. [Display omitted] •A low cost new heterometallic (Mn-Na) metal organic framework (MOF) is synthesized.•The crystallography reveals presence of two metal ions in the asymmetric unit i.e, Mn and Na.•Topological analysis shows a rare myc topology of the MOF which is very uncommon among the coordination polymers.•The resulting Mn-Na shows excellent selectivity, in the aqueous phase, for adsorption and separation of cationic dye, methylene blue (MB) with adsorption capacity to be 46.22 mg g−1.•The present material showed excellent structural stability and recyclability with pseudo-second-order kinetics for adsorption.•The plausible mechanism suggests that HSAB concept is responsible for the adsorption process. 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.
ISSN:	1387-7003 1879-0259
DOI:	10.1016/j.inoche.2022.110046