The graphs play an important role in our daily life. For example, the urban transport network can be represented by a graph, as the intersections are the vertices and the streets are the edges of the graph. Suppose that some edges of the graph are removed, the question arises, how damaged the graph is. There are some criteria for measuring the vulnerability of graph; the...

A method using thermal desorption sampling and analysis by proton transfer reaction mass spectrometry (PTRMS) to measure long chain alkanes (C12–C18) and other larger organics associated with diesel engine exhaust emissions is described. Long chain alkanes undergo dissociative proton transfer reactions forming a series of fragment ions with formula CnH2n+1. The PTR-MS is insensitive to nalkanes...

Layered organic–inorganic hybrids based on perovskite-derived alkylammonium lead halides have been demonstrated as important new materials in the construction of molecular electronic devices. Typical of this class of materials are the single-perovskite slab lead iodides of the general formula (CnH2n+1NH3)2PbI4 . While for small n, these compounds are amenable to single-crystal structure determi...

Three series of Au(I)-imidazole complexes with stoichiometries of [Au(Cn-bim)Cl], [Au(Cn-im)Cl], and [Au(Cn-im)2][NO3] x 2H2O (Cn-bim = N-CnH2n+1 -substituted benzimidazole and Cn-im = N-CnH2n+1-substituted imidazole) together with the compound of [Au(C18-bim)2][NO3] are synthesiszed. Typical structures of each series are determined by single crystal X-ray diffraction. The last series of compou...

Transition-metal alkane-thiolates (i.e., organic salts with formula Me(SR)x, where R is a linear aliphatic hydrocarbon group, –CnH2n+1) undergo a thermolysis reaction at moderately low temperatures (close to 200 °C), which produces metal atoms or metal sulfide species and an organic by-product, disulfide (RSSR) or thioether (RSR) molecules, respectively. Alkane-thiolates are non-polar chemical ...

2,6-Di(4-iodopyrazol-1-yl)pyridine is converted to 2,6-di(4-{alkyn-1-yl}pyrazol-1-yl)pyridine (L1R; R’=CnH2n−3, n=12, 14, 16) derivatives by Sonogashira reactions. Hydrogenation of these intermediates yields the corresponding 2,6-di(4-alkylpyrazol-1-yl)pyridine (L2R; R=CnH2n+1) derivatives. Homoleptic Fe[BF4]2 complexes all ligands were prepared, bearing four long chain substituents in a discot...

A new topological index J (based on distance sums s i as graph invariants) is proposed. For unsaturated or aromatic compounds, fractional bond orders are used in calculating s i. The degeneracy of J is lowest among all single topological indices described so far. The asymptotic behaviour of J is discussed, e.g. when n ~ ~ in CnH2n+2, J ~ ~r for linear alkanes, and J ~ ** for highly branched ones.

The oxidation of a gasoline model-fuel (2500 ppm n-heptane and 2500 isooctane), called RON 50, was studied in jet-stirred reactor (JSR) over the temperature range 560 ? 700 K, at total pressure 10 atm, residence time 1.5 s, an equivalence ratio 0.5. Gas samples were collected as function temperature. Ignition 50/air mixtures also rapid compression machine (RCM) under same fuel-lean conditions, ...

In the case of mixed-valence systems whose spin states are situated in the spin crossover region, new types of conjugated phenomena coupled with spin and charge are expected. From this viewpoint, we have investigated the multifunctional properties coupled with spin, charge and photon for the organic-inorganic hybrid system, A[Fe II Fe III X3](A = (n-CnH2n+1)4N, spiropyran; X = dto(C2O2S2), tto(...