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Open AccessArticle

New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

1
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China
2
Key Laboratory of Hunan Province for Comprehensive Utilization of Complex Copper-Lead Zinc Associated Metal Resources, Hunan Research Institute for Nonferrous Metals, Changsha 410100, Hunan, China
3
Institute of Theoretical and Computational Chemistry, Nanjing University, Nanjing 210023, Jiangsu, China
*
Authors to whom correspondence should be addressed.
These authors have equally contributed to this work.
Minerals 2018, 8(9), 368; https://doi.org/10.3390/min8090368
Received: 22 July 2018 / Revised: 15 August 2018 / Accepted: 19 August 2018 / Published: 25 August 2018
Novel collector lead(II)-benzohydroxamic acid (Pb(II)–BHA) complexes in aqueous solution were characterized by using experimental approaches, including Ultraviolet-visible (UV-Vis) spectroscopy and electrospray ionization-mass spectrometry (ESI-MS), as well as first-principle density functional theory (DFT) calculations with consideration for solvation effects. The Job plot delineated that a single coordinated Pb(BHA)+ should be formed first, and that the higher coordination number complexes can be formed subsequently. Moreover, the Pb(II)–BHA species can aggregate with each other to form complicated structures, such as Pb(BHA)2 or highly complicated complexes. ESI-MS results validated the existence of Pb-(BHA)n=1,2 under different solution pH values. Further, the first-principles calculations suggested that Pb(BHA)+ should be the most stable structure, and the Pb atom in Pb(BHA)+ will act as an active site to attack nucleophiles. These findings are meaningful to further illustrate the adsorption mechanism of Pb(II)–BHA complexes, and are helpful for developing new reagents in mineral processing. View Full-Text
Keywords: Pb(II)–BHA; lead chemistry; metal–organic collectors; DFT calculation; surface activation Pb(II)–BHA; lead chemistry; metal–organic collectors; DFT calculation; surface activation
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He, J.; Han, H.; Zhang, C.; Hu, Y.; Yuan, D.; Tian, M.; Chen, D.; Sun, W. New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study. Minerals 2018, 8, 368.

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