Single crystal structure analysis of lead ion-benzohydroxamic acid complex collector(Pb-BHA)
Lead ion-benzohydroxamic acid complex collector(Pb-BHA)shows good flotation performance and application prospect in the flotation of tungsten,cassiterite,ilmenite and other oxide ores,but its precise molecular structure is still unclear,which hindering the in-depth understanding of the flotation mechanism of the complex and the development of the molecular design of metal-group collector.In this paper,two single crystals of Pb-BHA complex(complex-1 and complex-2)with the molar ratio of lead ion to BHA of 1:1 and 2:1,respectively,were cultured,and their structures were analyzed by X-ray structure analysis,including the crystal structure,molecular structure,spatial packing structure and molecular interaction of the complex.The results show that the molecular formula of complex 1 is Pb6L8(NO3)4(HL=BHA),the molecular formula of complex-2 is[Pb6L8(NO3)3]NO3,and the coordination of lead ions with the oxygen atoms of ligand forms a non-planar"O,O"five-member ring chelate configuration,and the coordination number of lead ions are five,six and seven.Complex molecules are bonded to adjacent complexes by Pb—O bond to form three-dimensional extended stacked polymers with monomer repeating structure.The O…H,H…H,Pb…O are the main weak interactions in the complex.The π-π interaction dominates the intermolecular interaction,followed by N—H…O hydrogen bonding.The comprehensive analysis of the single crystal structure of Pb-BHA complex provides an important research basis for the study of the liquid phase structure of the complex,the adsorption structure of complex on mineral surface,the regulation method of complex's flotation behavior,the flotation mechanism and the molecular design of new metal-group collector.
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