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Molecular Recognition of Biologically Relevant Anions with an Expanded Dinuclear Copper(II) Complex: An Efficient Sensor for Oxalate Anion in Aqueous Solution

https://doi.org/10.1002/slct.202103111

Rhaman, Md Mhahabubur ; Owens, III, Harold ; Powell, Douglas R. ; Hossain, Md. Alamgir ( November 2021 , ChemistrySelect)

Abstract
An expanded dinuclear copper(II) complex (1) derived from a biphenyl‐based hexaazamacrocyle (L) was synthesized and characterized by single crystal X‐ray analysis, exhibiting a boat‐shaped cavity with an elongated Cu^II⋅⋅⋅Cu^IIdistance of 11.01 Å. The dinuclear copper(II) complex was investigated for a verity of biologically relevant anions including carboxylates (oxalate, citrate, tartrate, glutamate, adipate, acetate and benzoate), oxoanions (phosphate, sulphate, perchlorate and nitrate), and halides (fluoride, chloride, bromide and iodide) by competitive fluorescence titrationsviaindicator displacement assay (IDA) using an external dye (Eosin Y) in water‐methanol solution at neutral pH. The receptor was shown to exhibit strong affinity for oxalate, providing the binding trend: oxalate (logK=6.07)>citrate (logK=5.74)>phosphate (logK=5.02)>tartrate (logK=4.78)>glutamate (logK=4.42)>adipate (logK=4.31)>acetate (logK=4.14)>benzoate (logK=4.01). No interaction was observed for other anions including sulphate, perchlorate, nitrate, fluoride, chloride, bromide and iodide under the identical conditions.

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Supramolecular Assembly of Uridine Monophosphate (UMP) and Thymidine Monophosphate (TMP) with a Dinuclear Copper(II) Receptor

https://doi.org/10.1021/acsomega.7b01293

Rhaman, Md Mhahabubur ; Powell, Douglas R. ; Hossain, Md. Alamgir ( November 2017 , ACS Omega)
Experimental and Theoretical Studies on Halide Binding with a p -Xylyl-Based Azamacrocycle

https://doi.org/10.1021/jp511040p

Ahmed, Lucky ; Rhaman, Md Mhahabubur ; Mendy, John S. ; Wang, Jing ; Fronczek, Frank R. ; Powell, Douglas R. ; Leszczynski, Jerzy ; Hossain, Md. Alamgir ( January 2015 , The Journal of Physical Chemistry A)
An Ideal C 3 -Symmetric Sulfate Complex: Molecular Recognition of Oxoanions by m -Nitrophenyl- and Pentafluorophenyl-Functionalized Hexaurea Receptors

https://doi.org/10.1021/acsomega.7b01115

Portis, Bobby ; Mirchi, Ali ; Emami Khansari, Maryam ; Pramanik, Avijit ; Johnson, Corey R. ; Powell, Douglas R. ; Leszczynski, Jerzy ; Hossain, Md. Alamgir ( September 2017 , ACS Omega)
Anion Complexation Studies of 3-Nitrophenyl-Substituted Tripodal Thiourea Receptor: A Naked-Eye Detection of Sulfate via Fluoride Displacement Assay

https://doi.org/10.1021/acsomega.7b01485

Emami Khansari, Maryam ; Hasan, Mohammad H. ; Johnson, Corey R. ; Williams, Nya A. ; Wong, Bryan M. ; Powell, Douglas R. ; Tandon, Ritesh ; Hossain, Md. Alamgir ( December 2017 , ACS Omega)