Polynuclear Aminohydroximate Metallamacrocyclic Cu(II)‐Ce(III) Complexes: A Facile Route to Intricate Nanostructures of Copper and Cerium Oxides

Abstract

With an idea to explore the unique structure of the lanthanide 15‐MC‐5 metallacrowns, the water‐soluble Cu(II)‐Ce(III) aqua‐complexes, bearing aminohydroximate (glycine‐ and α‐phenylalanine) ligands have been synthesized and tested for preparing the target copper and cerium oxides under hydrothermal conditions. These Polynuclear heterometallic metallamacrocyclic complexes represent the unique single‐source precursors for a facile one‐pot, surfactant‐ and template‐free synthesis of nano‐ and mesocrystals with the intrinsic features of rough surfaces, high porosity, single‐crystalline structures and complex morphology. The structure, morphology, and composition of as‐prepared samples have been characterized by means of powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy‐dispersive spectroscopy (EDS). Our results suggest a very simple chemical route to guide the formation of beautiful self‐assembled nanostructures.

Synthesis and Molecular Structure of the First Metallamacrocyclic Bi(III)-Cu(II) 15-MC-5 Complex Derived from Pyrazinohydroxamic Acid

“…[4] The first planar 15-MC-5 uranyl complex was obtained by self assembly of picolinehydroxamic acid with Cu 2+ and UO 2 2+ ions. [15] A number of MCs were prepared in a similar way in the following few years, leading to the isolation of 15-MC-5 of copper and aminohydroxamic acids encapsulating Ln 3+ , [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Y 3+ , [31][32][33] and non-transition metals Ca 2+ , [33][34][35] Na + , [31] Ag + , [31] Pb 2+ , [31] and Hg 2+ . [31] Following our interest in Ln(III)-Cu(II) 15-MC-5 metallacrowns with aminohydroxamic ligands, we report now on a metallamacrocyclic complex constructed from Cu 2+ and Bi 3+ metal centers and aminohydroxamic moieties.…”

Water-Soluble Bismuth(III) Polynuclear Tyrosinehydroximate Metallamacrocyclic Complex: Structural Parallels to Lanthanide Metallacrowns

“…The Bi 3+ ion is located at the center of the 15-MC-5 ring consisting of five [Cu(II)-N-O] repeating units. Following our interest in water-soluble Ln(III)-Cu(II) 15-MC-5 metallacrowns with aminohydroximate ligands [ 30 , 31 , 32 , 33 , 34 ], we describe here a general synthetic approach and comparable characterization of a new water-soluble metallamacrocyclic Bi(III)-Cu(II) 15-MC-5 complex derived from tyrosinehydroxamic acid.…”