Experimental and Theoretical Study on the Pyrolysis Mechanism of Three Coal-Based Model Compounds

2014 ◽  
Vol 28 (2) ◽  
pp. 980-986 ◽  
Author(s):  
Gang Li ◽  
Lu Li ◽  
Lei Shi ◽  
Lijun Jin ◽  
Zichao Tang ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Model Compounds ◽  
Pyrolysis Mechanism

Intentional Hydrophilization of Aromatic Hydrocarbon Model Compounds: A Theoretical Study

Graphene ◽  
2014 ◽  
Vol 2 (2) ◽  
pp. 101-112
Author(s):  
L. Hykrdová ◽  
M. Bouša ◽  
J. Jirkovský
Keyword(s):  
Aromatic Hydrocarbon ◽  
Theoretical Study ◽  
Model Compounds

Sr(Hg1–xSnx)4: variations of the EuIn4-type structure

2015 ◽  
Vol 70 (4) ◽  
pp. 265-277
Author(s):  
Marco Wendorff ◽  
Caroline Röhr
Keyword(s):  
Density Functional ◽  
Valence Electron ◽  
Theoretical Study ◽  
Building Blocks ◽  
Type Structure ◽  
Intermediate Valence ◽  
Model Compounds ◽  
Functional Theory ◽  
X Ray ◽  
Successive Substitution

AbstractStarting from the new compound SrHg2Sn2, which is isoelectronic and also isotypic to the indide SrIn4, the successive substitution of Sn against the electron poor Hg has been investigated in a combined synthetic, crystallographic, and bond-theoretical study. Along the 1:4 section Sr(Hg1–xSnx)4 a series of compounds with Sn contents x between 0.5 and 0.2 were synthesized from stoichiometric ratios of the elements. Their crystal structures, which represent three different variants of the EuIn4-type structure, have been determined using single crystal X-ray data. The most electron rich compound SrHg2Sn2 crystallizes in the original EuIn4-type [monoclinic, C2/m, a = 1257.9(14), b = 490.1(4), c = 997.8(12) pm, β = 117.60(6)°, Z = 4, R1 = 0.0838], with a fully ordered Hg and Sn distribution. The four atom sites form two different folded ladders with an alternating Hg/Sn distribution. Like in the KHg2-type, the ladders are connected via six-membered rings. In between, double tubes with an internal Sn–Sn bond are connected via further Sn–Sn bonds to form sheets similar to those observed in SiAs. The most electron-poor phase SrHg3.2Sn0.8 crystallizes in a strongly distorted variant of this structure [a = 1172.8(4), b = 497.9(2), c = 1010.0(4) pm, β = 118.860(7)°, Z = 4, R1 = 0.0549]. Herein, additional Hg–Hg bonds are formed, and the open tubes are distorted into rods of edge-sharing rhombohedra resembling the structure motifs of elemental Hg. At an intermediate valence electron (v.e.) number, i.e., in SrHg2.5Sn1.5, an isomorphous tripled superstructure (a = 2704.4(5), b = 493.87(7), c = 1197.1(2) pm, β = 90.838(14)°, Z = 12, R1 = 0.0475) occurs, where the building blocks of the two variants of the EuIn4-type structure alternate in a 1:2 ratio. The bonding situation and the “coloring,” i.e., the Hg/Sn distribution in the polyanionic network, are discussed considering the different sizes of the atoms and the charge distribution (Bader AIM charges), which has been calculated within the framework of the FP-LAPW density functional theory for SrHg2Sn2 and the model compounds “SrHg3Sn” and “SrHg4.”

Theoretical study on the effect of the substituent groups on the homolysis of the ether bond in lignin trimer model compounds

2016 ◽  
Vol 44 (3) ◽  
pp. 335-341 ◽  
Author(s):  
Xiao-yan JIANG ◽  
Qiang LU ◽  
Xiao-chen DONG ◽  
Bin HU ◽  
Chang-qing DONG
Keyword(s):  
Theoretical Study ◽  
Model Compounds ◽  
Ether Bond

Theoretical Study of One-electron Redox Potentials of Some NADH Model Compounds

2010 ◽  
Vol 28 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Huajing Wang ◽  
Xiongyi Huang ◽  
Rong Shen ◽  
Lei Rui ◽  
Yao Fu
Keyword(s):  
Theoretical Study ◽  
Redox Potentials ◽  
Model Compounds

A theoretical study on bond dissociation enthalpies of coal based model compounds

Fuel ◽  
2015 ◽  
Vol 153 ◽  
pp. 70-77 ◽  
Author(s):  
Lu Li ◽  
Hongjun Fan ◽  
Haoquan Hu
Keyword(s):  
Theoretical Study ◽  
Model Compounds ◽  
Bond Dissociation
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