Chemistry and Optoelectronic Properties of Stacked Supramolecular Entities of Trinuclear Gold(I) Complexes Sandwiching Small Organic Acids

Carriedo

J Inorg Organomet Polym

et al. 2011

The pyrolysis of several physical mixtures of AuCl(PPh3) with polymeric [NP(O2C12H8)]n or cyclic N3P3(O2C12H8)3 phosphazenes, formed as solid powders or films with different molar ratios, have been studied under air and at 800°C. The characterization of the products has shown that the particle size and morphology are strongly dependent on the nature of the phosphazene, the phosphazene/AuCl(PPh3) molar ratio and on the preparation methodology. Gold nanoparticles (NPs) with mean sizes as small as 3.5 nm were obtained from a [NP(O2C12H8)]n/ AuCl(PPh3) 1:1 film. The particle morphology was also strongly dependent on the experimentally conditions of the pyrolysis.

Section: Possible Formation Mechanismmentioning

confidence: 98%

Section: Possible Formation Mechanismmentioning

confidence: 99%

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Polymer/Trimer/Metal Complex Mixtures as Precursors of Gold Nanoparticles: Tuning the Morphology in the Solid-State

Carriedo

J Inorg Organomet Polym

et al. 2011

“…[15,16,28,29] The {(1)(Mes)} unit sits on a threefold rotation axis. The 1-Mes-1-Mes planes are separated by 3.32, 3.19, and 3.32 which indicates relatively tight contacts.…”

Section: 2037(4)mentioning

confidence: 99%

Arene‐Sandwiched Silver(I) Pyrazolates

Dias

Gamage

2007

Angew Chem Int Ed

“…An alternative strategy is to design porous crystals of organometallic compounds. Remarkable changes in color and emission have been observed using a variety of transition-metal assemblies for which adsorption and desorption of organic vapors lead to significant variations in M-M interactions, [4,5] coordination modes, [6] conformation of p-conjugated ligands [7] and stacking interactions between coordination planes. [8] Crystal design is a forward-looking strategy for the development of functional vapochromic materials, as adsorption properties and color change can be Abstract: The first vapochromic organic crystals are described with respect to their preparation, color change, adsorption/desorption properties, crystal structures, and color-change mechanism.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Vapochromic Behaviors of Organic Crystals Based on the Open–Close Motions of S‐Shaped Donor–Acceptor Folding Units

Takahashi

Takaya

Naota

2010

Chemistry A European J

The first vapochromic organic crystals are described with respect to their preparation, color change, adsorption/desorption properties, crystal structures, and color-change mechanism. Non-solvatochromic, 1,4,5,8-naphthalene-tetracarboxylic diimide (NDI) derivatives 1 a bearing two pyrrole imine (PI) tethers have been used as a motif for the crystal packing template. Red-purple vapochromic solid 3 was prepared by evacuation of orange crystals 2 (equivalent to 1 a2 MeOH), obtained by recrystallization of 1 a from MeOH. Solid 3 showed high-adsorption ability and unprecedented vapor-dependent color changes upon exposure to a variety of organic vapors, whereas light brown amorphous solid 1 a, did not show vapo- or solvatochromic behavior toward any organic solvent. The strong adsorption capability of 3 was confirmed by TGA experiments and adsorption/desorption isotherms. Analysis of the solid-state UV/Vis analysis revealed that the vapor-dependent color changes of 3 were owed to the specific interference of solvent vapors with its broad CT absorbance at lambda=450-650 nm. Packing structures of 1 a in orange crystals 2, red-purple solid 3, and regenerated orange solid 2 were unequivocally established by single crystal and synchrotron powder X-ray diffraction, respectively. Molecular structures and arrays of 1 a in these materials indicated that 1) unit 1 a had an S-shaped folded conformation in 2 and 3 by intramolecular donor-acceptor interactions between NDI and two PI units; 2) inclusion of the guest vapor into the S-shaped template decreased the intramolecular PI-NDI interactions, accompanied by increasing intermolecular NDI-NDI and PI-PI interactions; and 3) such flexible, open-close motions of the S-shaped template could be repeated during reversible adsorption/desorption processes without degradation of crystal packing. The adsorption properties and mechanism of molecular shape-dependent vapochromic behavior of 3 are discussed with reference to experimental results, crystallographic data, and theoretical calculations.