Graphitic carbon nitride compounds were prepared by thermal treatment of C–N–H precursor mixtures (melamine C3N6H9, dicyandiamide C2N4H4). This led to solids based on polymerized heptazine or triazine ring units linked −N═ −NH– groups. The H content decreased, and the C/N ratio varied between 0.59 0.70 with preparation temperatures 550 650 °C due increased layer condensation. UV–vis spectra exhibited a strong π–π* transition near 400 nm semiconductor-like band edge extending into visible...

Carbon nitride compounds with high N : C ratios and graphitic to polymeric structures are being investigated as potential next-generation materials for incorporation in devices energy conversion storage well optoelectronic catalysis applications. The built from C- N-containing heterocycles heptazine or triazine rings linked via sp2-bonded atoms (N(C)3 units) -NH- groups. electronic, chemical optical functionalities determined by the nature of local extended composition materials. Because...

Amorphous ices govern a range of cosmological processes and are potentially key materials for explaining the anomalies liquid water. A substantial density gap between low-density high-density amorphous ice with water in middle is cornerstone our current understanding However, we show that ball milling "ordinary" I

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and spectroscopic properties of the .eta.2-dihydrogen complexes [MH(.eta.2-H2)PR2CH2CH2PR2)2] + (M = iron, ruthenium; R Ph, Et) trends in down iron group triadMaria T. Bautista, E. Paul Cappellani, Samantha D. Drouin, Robert H. Morris, Caroline Schweitzer, Andrea Sella, Jeffery ZubkowskiCite this: J. Am. Chem. Soc. 1991, 113, 13, 4876–4887Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published...

Weak hydrogen bonds, such as O-H···π and C-H···O, are thought to direct biochemical assembly, molecular recognition, chemical selectivity but seldom observed in solution. We have used neutron diffraction combined with H/D isotopic substitution obtain a detailed spatial orientational picture of the structure benzene-methanol mixtures. Our analysis reveals that methanol fully solvates surrounds each benzene molecule. The expected interaction is highly localised directional, hydroxyl bond...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of the hydrogen-hydrogen distances .eta.2-dihydrogen ligands in complexes trans-[M(.eta.2-H2)(H)(PR2CH2CH2PR2)2]+ [M = iron, ruthenium, R Ph, M osmium, Et] by solution NMR methodsMaria T. Bautista, Kelly A. Earl, Patricia Maltby, Robert H. Morris, Caroline Schweitzer, and Andrea. SellaCite this: J. Am. Chem. Soc. 1988, 110, 21, 7031–7036Publication Date (Print):October 1, 1988Publication History Published online1 May 2002Published...

A primary method for the production of 2D nanosheets is liquid-phase delamination from their 3D layered bulk analogues. Most strategies currently achieve this objective by significant mechanical energy input or chemical modification but these processes are detrimental to structure and properties resulting nanomaterials. Bulk poly(triazine imide) (PTI)-based carbon nitrides materials with a high degree crystalline order. Here, we demonstrate that semiconductors spontaneously soluble in select...

Abstract Elemental phosphorus displays an impressive number of allotropes with highly diverse chemical and physical properties. White has now been filled into single‐wall carbon nanotubes (SWCNTs) from the liquid thereby stabilized against exothermic reaction atmospheric oxygen. The encapsulated tetraphosphorus molecules were visualized transmission electron microscopy, but found to convert readily chain structures inside SWCNT “nanoreactors”. energies possible determined computationally,...

Dark-colored shiny flakes of graphitic carbon nitride materials produced by reacting dicyandiamide C2N4H4 in a KBr/LiBr molten salt medium were determined to have C/N ratio near 1.2:1. The compounds also contained 2.3–2.5 wt % H incorporated within N–H species identified Fourier transform infrared spectroscopy. One recent study revealed analogous results for thin films an similar synthesis method, while previous investigation instead reported formation crystalline gC3N4 with triazine-based...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship between intramolecular chemical exchange and NMR-observed rate constantsMalcolm L. H. Green, Luet Lok Wong, Andrea SellaCite this: Organometallics 1992, 11, 7, 2660–2668Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/om00043a059https://doi.org/10.1021/om00043a059research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Oxidation State of Ce in the Sandwich Molecule CeroceneN. M. Edelstein, P. G. Allen, J. Bucher, D. K. Shuh, C. Sofield, N. Kaltsoyannis, H. Maunder, R. Russo, and A. SellaView Author Information Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley, California 94720 Department Chemistry, University College London 20 Gordon Street, WC1H 0AJ, U.K. Cite this: Am. Chem. Soc. 1996, 118, 51, 13115–13116Publication Date...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomeric and dimeric ruthenium(II) .eta.2-dihydrogen complexes with tricyclohexylphosphine co-ligandsTherese Arliguie, Bruno Chaudret, Robert H. Morris, Andrea SellaCite this: Inorg. Chem. 1988, 27, 4, 598–599Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 February 1988https://pubs.acs.org/doi/10.1021/ic00277a006https://doi.org/10.1021/ic00277a006research-articleACS PublicationsRequest...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDihydrogen vs. dihydride. Correlations between electrochemical or UV PES data and force constants for carbonyl dinitrogen ligands in octahedral, d6 complexes their use explaining the behavior of dihydrogen ligandRobert H. Morris, Kelly A. Earl, Rudy L. Luck, Natalie J. Lazarowych, Andrea SellaCite this: Inorg. Chem. 1987, 26, 16, 2674–2683Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August...

Crystalline layered carbon nitrides can be inter-converted by simple ion exchange process allowing their properties to tuned.

The structures of equimolar mixtures the commonly used polar aprotic solvents dimethylformamide (DMF) and dimethylacetamide (DMAc) in dimethyl sulfoxide (DMSO) have been investigated via neutron diffraction augmented by extensive hydrogen/deuterium isotopic substitution. Detailed 3-dimensional structural models these solutions derived from data Empirical Potential Structure Refinement (EPSR). intermolecular center-of-mass (CoM) distributions show that first coordination shell amides...

Intermolecular forces are the fundamental architects of supramolecular structure. From liquid miscibility to formation organic crystals and biological structures, subtle interplays charge distribution determine outcome. Aromatic rings a key motif in chemistry that provide rigid highly directional interactions proteins nucleic acids. The aromatic delocalised π electrons is strongly modulated by substituents, giving rise complex patterns across molecule affect reactivity intermolecular...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR properties of the complexes trans-[M(.eta.2-H2)(H)(PEt2CH2CH2PEt2)2]+ (M = Fe, Ru, Os). Intramolecular exchange atoms between .eta.2-dihydrogen and hydride ligandsMaria Bautista, Kelly A. Earl, Robert H. Morris, Andrea SellaCite this: J. Am. Chem. Soc. 1987, 109, 12, 3780–3782Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June...

Reaction of LnI2 (Ln = Sm, Yb) with two equivalents NaTp(Me2) or reduction Eu(Tp(Me2))2OTf gives good yields the highly insoluble homoleptic Ln(II) complexes, Ln(Tp(Me2))2 Sm (1a), Yb (2a), Eu (3a)). Use additionally 4-ethyl substituted Tp(Me2,4Et) ligand produces analogous, but soluble Ln(Tp(Me2,4Et))2 (1-3b) complexes. Soluble compounds are also obtained Tp(Ph) and Tp(Tn) ligands (Tn thienyl), Ln(Tp(Ph))2 1c; Yb, 2c) Ln(Tp(Tn))2 1d; 2d). To provide benchmark parameters for structural...

The effect of pressure on amorphous Ge was probed by Raman spectroscopy combined with molecular-dynamics simulations. A large jump occurs in the principal peak position due to nearest-neighbor Ge-Ge vibrations at 11--12 GPa and 7--5.5 GPa, respectively, during increasing/decreasing a polyamorphic transition occurring between low-density semiconductor metallic high-density polyamorph (HDA). We measured superconducting temperature $({T}_{c})$ using magnetic susceptibility measurements diamond...

Abstract Elemental phosphorus displays an impressive number of allotropes with highly diverse chemical and physical properties. White has now been filled into single‐wall carbon nanotubes (SWCNTs) from the liquid thereby stabilized against exothermic reaction atmospheric oxygen. The encapsulated tetraphosphorus molecules were visualized transmission electron microscopy, but found to convert readily chain structures inside SWCNT “nanoreactors”. energies possible determined computationally,...

The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic chemical properties. Yet, the structural diversity of these main group elements is still poorly explored. Here we fill single-wall carbon nanotubes with elemental arsenic from vapor phase. Using electron microscopy, find chains highly reactive As4 molecules as well two new one-dimensional allotropes arsenic: a single-stranded zig-zag chain double-stranded ladder. These linear structures are...

The discovery of phosphorene, a single layer black phosphorus, has accelerated the investigation pnictogen nanomaterials, leading to recent identification arsenene and antimonene. These two-dimensional nanomaterials display physical properties superior those graphene for some applications. Recently, single-wall carbon nanotubes (SWCNTs) have been filled with P4 molecules from melt As4 vapor phase. Confined within SWCNTs, polymerization reactions yielded new one-dimensional allotropes. Here,...