title: From quantum motifs to assemble nanoaggregates: the preparation of organo-molybdenum hybrid nanostructures.
abstract: Nanoaggregates such as nanowires, nanoparticles, nanotubules, and nanoribbons were prepared from bulk crystals, which are shaped as needles (1), blocks (2), tubules (3α), and plates (3β), respectively, by grinding and ultrasonication. Nanowires have diameters of approximately 2 nm, lengths of thousands of nanmeters, and the distance between adjacent nanowires is approximately 2 nm. The diameters of nanoparticles range from 3 to 5 nm. Nanotubules display diameters of 70 nm and lengths of thousands of nanometers, and nanoribbons exhibit widths of approximately 50 nm and lengths of hundreds of nanometers. All of the bulk crystals have been synthesized by the wet chemical method. Single-crystal X-ray diffraction reveals that crystal 1 is constituted by infinite one-dimensional {[NH(3)CH(2)CH(NH(2))CH(3)](C(6)H(4)O(2))[μ(2)-OC(6)H(4)O](Mo(VI)-O-Na-O)[NH(2)CH(2)CH(NH(2))CH(3)]}(n) (1), which acts as a parallel aligned quantum wire forming lamellas that assemble themselves into multilayered architecture. Crystal 2 consists of discrete [NH(3)CH(2)CH(NH(2))CH(3)](2)[Mo(VI)O(2)(O(2)C(6)H(4))(2)] (2), which presents as quantum particles and repeats itself along a three-dimensional crystal lattice. Crystal 3α, formed under 5 °C, and 3β, crystallized above 10 °C, are both composed of (NH(3)CH(2)CH(2)NH(2))(2)[Mo(VI)O(2)(O(2)C(6)H(4))(2)](NH(2)CH(2)CH(2)NH(2))(0.5) (3) but are packed in different ways. In crystal 3α, four [Mo(VI)O(2)(O(2)C(6)H(4))(2)](2-) circle into a quantum tube that is further assembled into multitubular architecture. However, in crystal 3β, two [Mo(VI)O(2)(O(2)C(6)H(4))(2)](2-) form a bilayered quantum lamellar motif that is piled into multilayered architecture. TEM reveals that all of the morphologies of the nanoaggregates are associated with the structures of the quantum motifs in their crystal lattices, which provide successful and effective access to assemble controlled nanostructures from quantum motifs of fine-desired and well-ordered bulk crystals. The technology of grinding and ultrasonication to prepare nanoaggregates is simple and available.
authors.affiliation: Department of Chemistry, Capital Normal University, 100048 Beijing, China. lu-xiaoming@126.com
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Lu
authors.forename: Xudong
authors.initials: X
authors.lastname: Shi
authors.forename: Tao
authors.initials: T
authors.lastname: Min
mesh_terms: D008958:Models, Molecular; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D011789:Quantum Theory; D013499:Surface Properties
chemical_list: D009942:Organometallic Compounds; D008982:Molybdenum