نتایج جستجو برای: structural counts phenylene

تعداد نتایج: 449460  

Journal: :iranian journal of mathematical chemistry 2010
p. e. john s. aziz p. v. khadikar

structural codes vis-a-vis structural counts, like polynomials of a molecular graph, areimportant in computing graph-theoretical descriptors which are commonly known astopological indices. these indices are most important for characterizing carbon nanotubes(cnts). in this paper we have computed sadhana index (sd) for phenylenes and theirhexagonal squeezes using structural codes (counts). sadhan...

P. JOHN P. KHADIKAR S. AZIZ

Structural codes vis-a-vis structural counts, like polynomials of a molecular graph, are important in computing graph-theoretical descriptors which are commonly known as topological indices. These indices are most important for characterizing carbon nanotubes (CNTs). In this paper we have computed Sadhana index (Sd) for phenylenes and their hexagonal squeezes using structural codes (counts). Sa...

2014
Jan Kahlert Hans-Georg Stammler Beate Neumann Rachel A Harder Lothar Weber Mark A Fox

While carboranes with 2 n+2 and 2 n+4 (n=number of skeletal atoms) skeletal electrons (SE) are widely known, little has been reported on carboranes with odd SE numbers. Electrochemical measurements on two-cage assemblies, where two C-phenyl-ortho-carboranyl groups are linked by a para-phenylene or a para-tetrafluorophenylene bridge, revealed two well separated and reversible two-electron reduct...

2009
Maher A. Qaddoura Kevin D. Belfield

Several divinylic mesogenic monomers were synthesized based on coupling the monomer 4-(4-pentenyloxy)benzoic acid with chlorohydroquinone, 2,5-dihydroxy- acetophenone, methylhydroquinone or 2-methoxyhydroquinone. This resulted in novel mesogens of phenylene esters with different lateral substituent groups. The effect of the lateral substituent group on the thermotropic phase behavior for these ...

Journal: :Helvetica Chimica Acta 2022

Reactions between Co(NCS)2 and 24,24-[2,5-bis(cyclohexyloxy)-1,4-phenylene]di(13,22 : 26,33-terpyridine) (1), 24,24-[2,5-bis(cyclohexylmethoxy)-1,4-phenylene]di(13,22 (2), 24,24-[2,5-bis(2-phenylethoxy)-1,4-phenylene]di(13,22 (3) under conditions of crystal growth by layering at room temperature lead to 3-dimensional nets with either a cds or trinodal self-penetrating topology depending upon th...

Journal: :Chemical communications 2014
Stefanie Klotzbach Thorsten Scherpf Florian Beuerle

Molecular cubes constructed from catechol-functionalized tribenzotriquinacenes and 1,4-phenylene diboronic acids were synthesized in a one-pot procedure by crosslinking 20 individual components through a dynamic covalent approach. Structural identity of the nanocubes was confirmed by mass spectrometry and (1)H-NMR spectroscopy.

Journal: :Chemistry of Materials 2022

White-light broadband emission in the visible range from low-dimensional halide perovskites is commonly attributed to structural distortions lead bromide octahedra. In this paper, we report Dion–Jacobson-phase two-dimensional (2D) based on short aromatic diammonium cations, p-phenylene (pPDA), m-phenylene (mPDA), and two 1D compounds templated by o-phenylene (oPDA). All of exhibit white-light e...

Journal: :Die Pharmazie 1997
S A Shiba A A el-Khamry M E Shaban K S Atia

The hitherto unknown bis[quinazolin-4-one-2-yl]-m-phenylene (2d), and its 3-N-substituted derivatives were prepared from the corresponding bis[3,1-benzoxazin-4-one-2-yl]-m-phenylene (1) as precursor. The quinazolinone derivative 2d was converted into bis[quinazolin-4-thioxo-2-yl]-m-phenylene (3) via different routes, bis[4-chloroquinazolin-2-yl]-m-phenylene (8) and bis[4-hydrazinoquinazolin-2-y...

Journal: :Chemical communications 2012
Dustin E Gross Emre Discekici Jeffrey S Moore

A dynamic combinatorial approach for the synthesis of arylene ethynylene macrocycles (AEMs) from linear polymers is described. By using readily available carbazolyl-ethynylene copolymers as starting materials we obtained a number of novel macrocycles that would be difficult to prepare by traditional methods.

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