نتایج جستجو برای: n 2h 1

تعداد نتایج: 3351044  

Journal: :Dalton transactions 2015
Nandita M Weliange David S McGuinness Michael G Gardiner Jim Patel

The insertion of internal olefins (hydroalumination) and chain walking isomerisation at di-n-octylaluminium hydride [Al(Oct)2H], promoted by zirconocene dichloride [Cp2ZrCl2] has been studied. The reaction between [Cp2ZrCl2] and [Al(Oct)2H] in non-polar solvents leads to clusters containing bridging hydride ligands between Zr and Al. This system promotes hydroalumination of 1-octene but is larg...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2001
F Gómez-Garibay M D Arciniega C L Céspedes J Taboada J S Calderón

The aerial parts of Tephrosia carrollii afforded two chromene chalcones. Their structures and stereochemistry were established by spectroscopic methods. The structure of oaxacacin was revised and confirmed by X-ray diffraction. In this paper, we describe the isolation of the chalcone known as "oaxacacin" and the new chalcone named epoxyobovatachalcone. The compound der. oaxacacin was found to b...

2011
Qian Qiao Mei Tian Da-Yong Liu Shu-Jiang Wang

In the title compound, [Ag(2)(C(14)H(14)N(4))(2)](C(14)H(8)N(2)O(4))·2H(2)O, each of the two unique Ag(+) ions is two-coordinated by two N atoms from two different 1,4-bis-[(imidazol-1-yl)meth-yl]benzene ligands in an almost linear fashion [N-Ag-N = 170.34 (10) and 160.25 (10)°]. The 4,4'-diazenediyldibenzoate anions do not coordinate to Ag. O-H⋯O hydrogen bonds stabilize the crystal structure.

Journal: :Acta Crystallographica Section E Structure Reports Online 2013

Journal: :Chemical and Pharmaceutical Bulletin 1983

Journal: :Angewandte Chemie 2023

Abstract Metallic conductive 1T phase molybdenum sulfide (MoS 2 ) has been identified as promising anode for sodium ion (Na + batteries, but its metastable feature makes it difficult to obtain and restacking during the charge/discharge processing result in part capacity reversibility. Herein, a synergetic effect of atomic‐interface engineering is employed constructing 2H‐MoS layers assembled on...

2013
H. C. Devarajegowda K. Mahesh Kumar S. Seenivasa H. K. Arunkashi O. Kotresh

In the title compound, C(16)H(17)NO(4)S(2), the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.070 (1) Å, and the morpholine ring adopts a chair conformation; the bond-angle sum for its N atom is 357.9°. The dihedral angle between the the 2H-chromene ring and the best plane through the morpholine ring is 89.09 (6)°. An intra-molecular C-H⋯S hydrogen bond occurs. In the ...

Journal: :Electr. J. Comb. 1998
Yury J. Ionin

For every positive integer m, we construct a symmetric (v, k, λ)-design with parameters v = h((2h−1) 2m−1) h−1 , k = h(2h − 1)2m−1, and λ = h(h − 1)(2h − 1)2m−2, where h = ±3 · 2 and |2h − 1| is a prime power. For m ≥ 2 and d ≥ 1, these parameter values were previously undecided. The tools used in the construction are balanced generalized weighing matrices and regular Hadamard matrices of order...

Journal: :Indian Journal of Pure and Applied Mathematics 2023

Let $$G = K_{n_1,n_2,\cdots ,n_t}$$ be a complete t-partite graph on $$n=\sum _{i=1}^t n_i$$ vertices. The distance between vertices i and j in G, denoted by $$d_{ij}$$ is defined to the length of shortest path j. squared matrix $$\Delta (G)$$ G $$n\times n$$ with $$(i,j)^{th}$$ entry equal 0 if $$i j$$ $$d_{ij}^2$$ \ne . We define energy $$E_{\Delta }(G)$$ sum absolute values its eigenvalues. ...

2010
Hossein Eshtiagh-Hosseini Nafiseh Alfi Masoud Mirzaei Marek Necas

In the title compound, C(4)H(12)N(2) (2+)·2C(6)H(3)N(2)O(4) (-)·2H(2)O or (1,4-dacH(2))(pyzdcH)(2)·2H(2)O, the complete dication is generated by crystallographic inversion symmetry. An intra-molecular O-H⋯O hydrogen bond occurs in the anion. In the crystal, O-H⋯O, O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds result in the formation of a three-dimensional network. Additionally, π-π stacking inter-actio...

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