J. Appl. Cryst.の発刊に際して

A graph labeling is an assignment of integers to the vertices or edges, or both, subject to certain conditions. Graph labelings were first introduced in the late 1960s. In the intervening years dozens of graph labelings techniques have been studied in over 1000 papers. Finding out what has been done for any particular kind of labeling and keeping up with new discoveries is difficult because of the sheer number of papers and because many of the papers have appeared in journals that are not widely available. In this survey I have collected everything I could find on graph labeling. For the convenience of the reader the survey includes a detailed table of contents and index.

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A Dynamic Survey of Graph Labeling

Chem. Pharm. Bull.(オピニオン)

Bull. Chem. Soc. Jpn. への投稿のすすめ

(E)-N′-(2-Nitrobenzylidene)-benzenesulfonohydrazide (NBBSH) was prepared from 2-nitrobenzaldehyde and benzenesulfonylhydrazine by using a simple condensation process with medium yield. It was then crystallized in methanol and characterized using various spectroscopic techniques such as Fourier transform infra-red spectroscopy (FTIR), ultra-violet visible spectroscopy (UV-vis), proton nuclear magnetic resonance (1H-NMR), X-ray photoelectron spectroscopy (XPS), and carbon-13 nuclear magnetic resonance (13C-NMR). The structure of the NBBSH molecule was confirmed using the single crystal X-ray diffraction technique (SCXRDT). A thin layer of NBBSH slurry was deposited onto a cleaned and dried flat round surface of GCE with a binding agent (Nafion) to fabricate a sensitive and selective heavy metal ion (HMI) sensor. The fabricated NBBSH/GCE sensor exhibited enhanced sensing performances such as sensitivity, limit of detection (LOD), linear dynamic range (LDR), and long-term stability towards selective arsenic ions. The calibration curve (CC) was found to be linear over a broad range of As3+ conc. (0.1 nM–0.1 M) and the calculated sensitivity and LOD (based on 3N/S) were found to be ∼190.0 pA μM−1 cm−2 and 50.0 pM, respectively. This novel approach can be used as an efficient path for the development of HMI sensors regarding monitoring of hazardous materials in biological and environmental sciences.

Arsenic sensor development based on modification with (E)-N′-(2-nitrobenzylidine)-benzenesulfonohydrazide: a real sample analysis

In the title compound, C11H14N2O5S, the amide O atom acts as a hydrogen-bond acceptor from a carboxyl­ate O atom and a secondary amino N atom. In addition, one of the sulfonyl O atoms and the carbonyl O atom of the carboxyl group also form hydrogen bonds with the primary amido N atom. These intermolecular hydrogen-bonding inter­actions give rise to a layer structure, with the layers parallel to the ac plane.

https://journals.iucr.org/e/issues/2010/03/00/bv2133/bv2133.pdf

N-(p-Tolyl-sulfon-yl)-l-asparagine.

The title compound, C10H12BrNO4S, is an inter­mediate in the synthesis of benzothia­zine. The planar methyl ester group (maximum deviation is 0.0065 A) is oriented at a dihedral angle of 39.09 (13)° with respect to the aromatic ring. In the crystal structure, weak inter­molecular C—H⋯O inter­actions link the mol­ecules into centrosymmetric dimers, through R22(10) ring motifs.

https://journals.iucr.org/e/issues/2009/05/00/hk2657/hk2657.pdf

Methyl 5-bromo-2-[meth­yl(methyl­sulfon­yl)amino]benzoate

In this study, an attempt is made to improve the tribological properties of austenitic 201 stainless steel by coating with TiN via physical vapor deposition followed by cathodic cage plasma nitriding (CCPN) under optimum conditions. The outcomes of TiN coating and CCPN treatment were examined individually as well in order to find the optimal method of producing corrosion-free surface coatings. The base and coated coupons were analyzed for structural, morphological and mechanical changes by performing Vickers micro-hardness analysis, X-ray diffraction analysis, wear track analysis and SEM and AFM analyses. The CCPN treatment of TiN-coated coupons resulted in significantly higher hardness and stability than the base and TiN-coated coupons. The linear polarization resistance (LPR) of base, TiN-coated and CCPN-coated coupons was measured about 141, 356 and 558 kΩ.cm2, respectively. LPR of CCPN-coated coupons was four times higher than that of the base coupon. The high LPR of CCPN-coated coupons demonstrates their superior stability and performance in harsh environments. CCPN-treated coupons had the lowest wear rate, corrosion rate and wear volume among all the tested coupons. These findings reveal that CCPN treatment of TiN-coated coupons is a more appropriate method of enhancing surface hardness, wear resistance and corrosion resistance.

Comparative study of PVD titanium nitride coating with cathodic cage plasma nitriding of austenitic 201 stainless steel for enhanced tribological properties

Topological indices are numerical parameters of a graph which characterize its topology and are usually graph invariant. In QSAR/QSPR study, physico-chemical properties and topological indices such as Randic, atom-bond connectivity ´ (ABC) and geometric-arithmetic (GA) index are used to predict the bioactivity of chemical compounds. Graph theory has found a considerable use in this area of research. In this paper, we study and derive analytical closed results of general Randic index ´ Rα(G) with α = 1, 1 2 ,−1,−1 2 , for boron triangular sheet BTS(m,n), borophene chain of B36(n) and melem chain MC(n). We also compute the general first Zagreb, ABC, GA, ABC4 and GA5 indices of sheet and chains for the first time and give closed formulas of these degree based indices.

http://jmathnano.sru.ac.ir/article_705_5f1e113c297e2d34b446d432f8a75049.pdf

On topological properties of boron triangular sheet BTS(m,n), borophene chain B36(n) and melem chain MC(n) nanostructures

In the title compound, C13H10BrNO4S, the dihedral angle between the benzene rings is 82.75 (15)°. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal structure, two mol­ecules form an R22(8) centrosymmetric dimer through a pair of O—H⋯O hydrogen bonds. Intra- and inter­molecular C—H⋯O hydrogen bonds are also observed.

https://journals.iucr.org/e/issues/2009/07/00/is2431/is2431.pdf

Muhammad Shafiq

Papers

N-(p-Tolyl-sulfon-yl)-l-asparagine.

Methyl 5-bromo-2-[methyl(methylsulfonyl)amino]benzoate

Comparative study of PVD titanium nitride coating with cathodic cage plasma nitriding of austenitic 201 stainless steel for enhanced tribological properties

On topological properties of boron triangular sheet BTS(m,n), borophene chain B36(n) and melem chain MC(n) nanostructures

2-(4-Bromo-benzene-sulfonamido)benzoic acid.

Muhammad Shafiq

Papers

N-(p-Tolyl-sulfon-yl)-l-asparagine.

Methyl 5-bromo-2-[meth­yl(methyl­sulfon­yl)amino]benzoate

Comparative study of PVD titanium nitride coating with cathodic cage plasma nitriding of austenitic 201 stainless steel for enhanced tribological properties

On topological properties of boron triangular sheet BTS(m,n), borophene chain B36(n) and melem chain MC(n) nanostructures

2-(4-Bromo-benzene-sulfonamido)benzoic acid.

Methyl 5-bromo-2-[methyl(methylsulfonyl)amino]benzoate