A Simple Synthesis of Higher Refractive Index Polymeric Nanocomposite Containing the Pendant ZnS Nanocrystals Capping Different Amount of Mercaptoethanol

In this paper, three kinds of ZnS NPs capping different amount of mercaptoethanol (ME) were synthesized, and the effect of capping amount on ZnS NPs was studied, indicating that the capping amount of ME on ZnS surface decreases, while ZnS size increases as the decrease of added capping agent in synthesis process, and ZnS NP capping middle amount of ME (~27.7 wt%) shows a highest apparent refractive index (RI) value. ZnS NPs were composited into polymeric matrices by a simple “one-step” thermocuring method characterized by adding a small amount of functional monomer of glycidyl methacrylate (GMA) and solvent of N,N-dimethylformamide (DMF) The reaction mechanism, studied by 1H NMR spectra, indicates that the epoxy of GMA monomer can be easily opened and chemically grafted on ME-capped ZnS surface under the catalysis of DMF, and then copolymerized with other monomer. By the route, ZnS NPs can be composited into pure poly(N,N-dimethylacrylamide)-type (DMA-type), DMA-type copolymer, and DMA-free matrices to fabricate transparent films, and its RI value can be improved by either optimizing capping amount on ZnS surface or increasing ZnS content in the nanocomposites. The RI value of resulting dried nanocomposites can be improved to 1.764 by compositing 80 wt% ZnS capping middle amount of ME.

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Effect of medium on 1H-NMR spectra

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19811549 ◽

1981 ◽

Vol 46 (7) ◽

pp. 1549-1553 ◽

Cited By ~ 1

Author(s):

Vojtěch Bekárek ◽

Vilém Šimánek

Keyword(s):

Refractive Index ◽

1H Nmr ◽

Relative Permittivity ◽

Nmr Spectra ◽

Chemical Shifts ◽

1H Nmr Spectra ◽

H Nmr ◽

Induced Changes

1H NMR spectra of benzene, salicylaldehyde, 2-nitroaniline, 4-nitroaniline and 4-aminotoluene have been measured in 13 solvents. The solvent-induced changes in chemical shifts of the proton signals of these compounds have been correlated with refractive index and relative permittivity (D) by the Rummens equation extended by the term f(D) = ((D - 1)/(2D + 1))2.

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Synthesis and antifungal activity of new salicylic acid derivatives

Polish Journal of Chemical Technology ◽

10.1515/pjct-2017-0019 ◽

2017 ◽

Vol 19 (1) ◽

pp. 143-148 ◽

Cited By ~ 4

Author(s):

Alicja Wodnicka ◽

Elżbieta Huzar ◽

Maria Krawczyk ◽

Halina Kwiecień

Keyword(s):

Salicylic Acid ◽

Nmr Spectra ◽

Fungicidal Activity ◽

Pathogenic Fungi ◽

Good Activity ◽

H Nmr ◽

Step Procedure ◽

One Step ◽

Salicylic Acid Derivatives

Abstract A simple one-step procedure for synthesis of 1-methoxy-1-oxoalkan-2-yl salicylates and 1-methoxy-1-oxoalkan-2-yl 2-[(1-methoxy-1-oxoalkan-2-yl)oxy]benzoates by reaction of salicylic acid with several methyl 2-bromoalkanoates was developed. The reactions were carried out in N,N-dimethylformamide (DMF) in the presence of anhydrous potassium carbonate. Conditions for regioselective synthesis of target compounds were established. The developed procedure could be easily applied in the industrial production process. The new salicylic acid derivatives were obtained with satisfactory yields and were characterized by MS and 1H NMR spectra. The fungicidal activity of the prepared compounds was tested in vitro against seven species of plant pathogenic fungi. The best results were observed for 1-methoxy-1-oxoalkan-2-yl salicylates which showed moderate or good activity against Botrytis cinerea and Rhizoctonia solani.

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Conformational structure of ethylene glycol dibenzoate. Vibrational and NMR spectra

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19811913 ◽

1981 ◽

Vol 46 (8) ◽

pp. 1913-1929 ◽

Cited By ~ 3

Author(s):

Bohdan Schneider ◽

Pavel Sedláček ◽

Jan Štokr ◽

Danica Doskočilová ◽

Jan Lövy

Keyword(s):

Ethylene Glycol ◽

Vibrational Spectra ◽

Nmr Spectra ◽

Coupling Constants ◽

Conformational Structure ◽

Infrared And Raman Spectra ◽

H Nmr ◽

Liquid States ◽

Crystalline Forms ◽

C Nmr

It was found that three crystalline forms of ethylene glycol dibenzoate can be prepared. Infrared and Raman spectra of these three forms, as well as of the glassy and liquid states, were measured. From 3JHH coupling constants obtained by analysis of the 13C satellite band of the -CH2- group in 1H NMR spectra, and from the 3JCH coupling constants of the -CO.O.CH2- fragment obtained by analysis of the carbonyl band in 13C NMR spectra it was found that in the liquid state the -CH2-CH2- group exists predominantly in the gauche conformational structure, and the bonds C-O-C-C assume predominantly a trans orientation. The results of the analysis of NMR and vibrational spectra were used for the structural interpretation of conformationally sensitive bands in vibrational spectra of ethylene glycol dibenzoate.

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Preparation and absolute configuration at C(20) of 21-nor-5α-chol-22-en-24→20-olide derivatives

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19810917 ◽

1981 ◽

Vol 46 (4) ◽

pp. 917-925 ◽

Cited By ~ 2

Author(s):

Vladimír Pouzar ◽

Miroslav Havel

Keyword(s):

Absolute Configuration ◽

Nmr Spectra ◽

Lithium Salt ◽

H Nmr ◽

Chemical Correlation ◽

Unsaturated Lactones

Reaction of the aldehyde I with the lithium salt of 1-(2-tetrahydropyranyloxy)-2-propyne yielded the compounds II and IV. From the compound II the lactone XII was prepared via the intermediates III and X, the lactone XVIII was prepared from the substance IV via the intermediates V and XVI. The unsaturated lactones XII and XVIII were also prepared by sulfenylation and dehydrosulfenylation of the saturated lactones XIII and XIX. Based on chemical correlation and 1H-NMR spectra analyses of the compounds II and IV, the lactone XII was assigned the 20R-configuration whereas the lactone XVIII was allotted the 20S-configuration.

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New type of addition to 5-substituted 4-arylidene-2-(4,5-dihydrofurfurylidene)-N,N-dimethyliminium bisperchlorates. Preparation of 4-substituted 5-(N,N-dimethylamino)-2-furancarbaldehydes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19860573 ◽

1986 ◽

Vol 51 (3) ◽

pp. 573-580 ◽

Cited By ~ 3

Author(s):

Tibor Gracza ◽

Zdeněk Arnold ◽

Jaroslav Kováč

Keyword(s):

Nmr Spectra ◽

Addition Reaction ◽

H Nmr ◽

Organic Bases ◽

New Type

4-Arilidene-5-(N,N-dimethyliminium)-2-(4,5-dihydrofurfurylidene)-N,N-dimethyliminium bisperchlorate I undergoes a 1,4-addition reaction with organic bases under re-formation of the furan nucleus; this behaviour has been utilized in the preparation of new 4-substituted 5-(N,N-dimethylamino)-2-furancarbaldehydes II, III. The structure of the prepared compounds has been confirmed by 13C and 1H NMR spectra.

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Preparation, properties and structure of some intermediate nido- and arachno-monocarbaboranes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19812345 ◽

1981 ◽

Vol 46 (10) ◽

pp. 2345-2353 ◽

Cited By ~ 33

Author(s):

Karel Baše ◽

Bohumil Štíbr ◽

Jiří Dolanský ◽

Josef Duben

Keyword(s):

Transition Metal ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Nmr Spectra ◽

Liquid Ammonia ◽

X Ray Diffraction ◽

X Ray ◽

H Nmr ◽

Starting Compound

The 6-N(CH3)3-6-CB9H11 carbaborane reacts with sodium in liquid ammonia with the formation of 6-CB9H12- which was used as a starting compound for preparing the 4-CB8H14, 9-L-6-CB9H13 (L = (CH3)2S, CH3CN and P(C6H5)3), 1-(η5-C5H5)-1,2-FeCB9H10-, and 2,3-(η5-C5H5)2-2,31-Co2CB9H10- carboranes. The 4-CB8H14 compound was dehydrogenated at 623 K to give 4-(7)-CB8H12 carborane. Base degradation of 6-N(CH3)3-6-CB9H11 in methanol resulted in the formation of 3,4-μ-N(CH3)3CH-B5H10. The structure of all compounds was proposed on the basis of their 11B and 1H NMR spectra and X-ray diffraction was used in the case of the transition metal complexes.

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The preparation of 3-amino-3-deoxy-1,2-O-isopropylidene-α-L-erythrofuranose, 3-amino-3-deoxy-1,2-O-isopropylidene-β-D-threofuranose and their derivatives

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19803378 ◽

1980 ◽

Vol 45 (12) ◽

pp. 3378-3390 ◽

Cited By ~ 3

Author(s):

Jiří Jarý ◽

Milena Masojídková ◽

Ivan Kozák ◽

Miroslav Marek ◽

Jan Staněk

Keyword(s):

Nucleophilic Substitution ◽

Sodium Azide ◽

Sodium Benzoate ◽

Nmr Spectra ◽

Subsequent Reduction ◽

H Nmr ◽

Amino Derivatives

The title amino derivatives VI and XIV were prepared by nucleophilic substitution of p-toluenesulfonyl derivatives II and XVII with sodium azide or hydrazine and subsequent reduction. Nucleophilic substitution of compounds II and XVII with sodium benzoate was also investigated. The 1H NMR spectra of the substances prepared are discussed.

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Preparation of (20E)-21-Ethoxycarbonyl-14β,17α-pregna-5,20-dien-3β-yl Hydrogen Butanedioate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19950715 ◽

1995 ◽

Vol 60 (4) ◽

pp. 715-718 ◽

Cited By ~ 1

Author(s):

Vladimír Pouzar ◽

Ivan Černý

Keyword(s):

Title Compound ◽

Nmr Spectra ◽

Total Yield ◽

Reaction Sequence ◽

Pregnane Series ◽

H Nmr

The title compound X was prepared according to the recently published procedure for preparation of analogous derivatives in the 5β-pregnane series, using the reaction sequence I -> II -> III -> IV -> V -> VI -> VII -> VII -> IX -> X (total yield 18%). The configuration at ring D centers (14β,17α) follows from the structure of the starting ketone I and was also checked by comparing diol IV with the sample prepared by an independent route. The epimeric purity at C-17 was carefully monitored during the whole synthesis by 1H NMR spectra (singlet of 18-H3).

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119Sn, 13C and 1H NMR Spectra of Tris(1-butyl)stannyl D-Glucuronate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19971169 ◽

1997 ◽

Vol 62 (8) ◽

pp. 1169-1176 ◽

Cited By ~ 2

Author(s):

Antonín Lyčka ◽

Jaroslav Holeček ◽

David Micák

Keyword(s):

Chemical Shift ◽

Carbonyl Group ◽

1H Nmr ◽

Equatorial Plane ◽

Title Compound ◽

Nmr Spectra ◽

Hydroxyl Groups ◽

Carboxylic Group ◽

H Nmr ◽

Oxygen Atoms

The 119Sn, 13C and 1H NMR spectra of tris(1-butyl)stannyl D-glucuronate have been measured in hexadeuteriodimethyl sulfoxide, tetradeuteriomethanol and deuteriochloroform. The chemical shift values have been assigned unambiguously with the help of H,H-COSY, TOCSY, H,C-COSY and 1H-13C HMQC-RELAY. From the analysis of parameters of 119Sn, 13C and 1H NMR spectra of the title compound and their comparison with the corresponding spectra of tris(1-butyl)stannyl acetate and other carboxylates it follows that in solutions of non-coordinating solvents (deuteriochloroform) the title compound is present in the form of more or less isolated individual molecules with pseudotetrahedral environment around the central tin atom and with monodentately bound carboxylic group. The interaction of tin atom with oxygen atoms of carbonyl group and hydroxyl groups of the saccharide residue - if they are present at all - are very weak. In solutions in coordinating solvents (hexadeuteriodimethyl sulfoxide or tetradeuteriomethanol), the title compound forms complexes with one molecule of the solvent. Particles of these complexes have a shape of trigonal bipyramid with the 1-butyl substituents in equatorial plane and the oxygen atoms of monodentate carboxylic group and coordinating solvent in axial positions.

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A 15N, 13C, and 1H NMR study of reaction products from arylguanidines and chloroformate esters

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19911505 ◽

1991 ◽

Vol 56 (7) ◽

pp. 1505-1511 ◽

Cited By ~ 2

Author(s):

Antonín Lyčka ◽

Karel Palát

Keyword(s):

1H Nmr ◽

Nmr Spectra ◽

Reaction Products ◽

H Nmr ◽

Nmr Study

The 15N, 13C, and 1H NMR spectra of the reaction products from arylguanidines with two mols of chloroformate esters have been measured. With application of the corresponding 15N isotopomer it has been proved that the reaction products have the structures IIIa-IIIc.

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