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1. |
Solute-Affected Vibrational Spectra of Water in Ca[C104)2Aqueous Solutions |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 369-381
Janusz Stangret,
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摘要:
A method of investigating hydration of a solute (beginning with infinite dilution) with the use of vibrational spectra has been presented. The procedure has been applied to aqueous Ca(C104)2solution spectra of OD(HDO) fundamental stretching vibration and combination vibrations of H2O (1100 – 1300 nm). The number of Ca(c104)2-affected water molecules has been determined; the obtained hydration spectra reveal anion-affected and cation-affected water bands.
ISSN:0038-7010
DOI:10.1080/00387018808082314
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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2. |
1H and13C NMR Assignments of Acridine |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 383-391
S. Ramaprasad,
M. Nauman,
K. Morden,
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摘要:
A complete set of unambiguous1H and13C NMR assignments of Acridine in CDCl3has been made using nuclear overhauser (NOE) experiments and 2D NMR techniques. The usefulness of 20 Heteronuclear technique using long range (13C−1H) couplings leading to proper assignment of the two quaternary carbons in the molecule is also highlighted. Accurate (1H−1H) coupling constants obtained after a spectral simulation are presented. Several13C−1H couplings and 1-bond13C−13C couplings are also reported.
ISSN:0038-7010
DOI:10.1080/00387018808082315
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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3. |
Spectrophotometric Determination of Thioxanthenes With Iodine |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 393-409
M. Rizk,
M.I. Walash,
A. El-Brashy,
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摘要:
A simple and rapid spectrophotometrie method for the quantitative determination of thioxanthene derivatives; chlorprothixene, thiothixene and methixene either in their pure form or in tablets was developed. The method is based upon, the formation of charge transfer complexes with iodine. The spectra of the complex show maxima at 360 and 275 nm with a high apparent molar absorptivity which facilitates the determination of 1–20 μg.ml−1of the intestigated compounds. The mean recoveries are: 100. 1/2 6 ± 1.38%, 100.32 ± 1.15% and 99.87 ± 1.12% for chlorprothixene, thiothixene and methixene respectively. The method is applied to determine these drugs as single, entities or in certain formulations and the results compare favourably to compendial methods.
ISSN:0038-7010
DOI:10.1080/00387018808082316
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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4. |
Spectrophotometric Determination of Cobalt (II) Using 5,5-Dimethyl-1,2,3- Cyclohexanetrione 1,2-Dioxime 3- Thiosemicarbazone |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 411-420
A. Qamhieh,
A.H. Laila,
R. Salim,
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摘要:
The reagent 5,5-dimethyl-1,2,3-cyclohexanetrione 1,2-dioxime 3-thiosemicarbazone (DCDT) has been used for the spectrophotometrie determination of cobalt (II). Various factors affecting the sensitivity of this determination have been studied. These factors include wavelength, standing time and pH. The range of applicability of Beer's law on this determination has been concluded and its sensitivity has been calculated and compared with other reagents used for
ISSN:0038-7010
DOI:10.1080/00387018808082317
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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5. |
Application of Proton Magnetic Resonance Spectrometry in the Analysis of Piroxicam and its Pharmaceutical Formulations |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 421-427
S.A. Abdel Fattah,
S.Z. El-khateeb,
S.A. Abdel Razeg,
M.S. Stawukkol,
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摘要:
A new simple and rapid quantitative proton magnetic resonance method has been developed for the determination of piroxicam in pure form and in pharmaceutical dosage forms.
ISSN:0038-7010
DOI:10.1080/00387018808082318
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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6. |
The Infrared Spectra of the First Transition Series Metal(II) Bis(Aquo) Complexes Of 8-Hydroxyquinoline |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 429-437
Carola Engelter,
GrahamE. Jackson,
CherylL. Knight,
DavidA. Thornton,
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摘要:
The infrared spectra (700–100 cm−1) of the complexes [M(ox)2(H2O)2] (ox = 8-hydroxyquinolinate anion, M = Mn, Fe, Co, Ni, Cu, Zn) are discussed. For the purposes of assignment of the metal ligand modes, deuterated 8-hydroxyquinoline-d7was prepared by the Skraup synthesis and the spectra of the deuterated complexes were compared with those of the unlabelled species. Furthermore, [64Zn(ox)2(H2O)2] and [68Zn(ox)2(H2O)2] were prepared by reaction of64ZnSO4and68ZnSO4with 8-hydroxyquinoline and the effects of metal isotope labelling on the spectra were examined and compared with earlier isotopic data on the nickel and zinc complexes.
ISSN:0038-7010
DOI:10.1080/00387018808082319
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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7. |
Metal ion interactions with a glutamate containing |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 439-446
M. Zineddine,
M. Asso,
R. Panossian,
M. Guiliano,
Benliant,
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摘要:
An approach to the study of calcium binding proteins, is the chemical synthesis of analogues of the single metal ion binding site, and the comparison of their metal ion binding characteristics(1). Synthesized fragments were also characterized as biologically act ive(2).
ISSN:0038-7010
DOI:10.1080/00387018808082320
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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8. |
The A4η-X4Σ System op Tiie Mon Molecule |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 447-464
E.A. Pazyuk,
S.N. Moekvitina,
Yu.Ya. Kyzyakov,
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摘要:
Absorption spectrum of MoN has been obtained in the 500–670 nra region by intracavity laser spectroscopy. Vibrational analysis of A > I Z transition has been carried out. Molecular constants for the upper (A4η) and ground (X4Σ) states have been determined.
ISSN:0038-7010
DOI:10.1080/00387018808082321
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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9. |
Molecular Emission Spectrohetry ih a Low Pressure Electrical Discharge |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 465-476
T. Yu,
J.D. Winefordner,
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摘要:
A low pressure electrical discharge for excitation of polycyclic aromatic hydrocarbons, PAHs, without fragmentation is described. The discharge characteristics as well as the plasma background spectra are given. The application of the discharge for the excitation of molecular spectra of PAHs is described. Difficulties with correction of the analyte emission spectrum for the background emission spectrum of the gas (He) are mentioned. Analytical use of the discharge for detection of PAH3 introduced by gas chromatography is described and is shown to be of marginal analytical use because of the rather poor detection limits of about 1 μg.
ISSN:0038-7010
DOI:10.1080/00387018808082322
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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10. |
Nmr and Mass Spectroscopic Studies of the Competitive-Angiotensin II Antagonist “Sarmesin” |
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Spectroscopy Letters,
Volume 21,
Issue 5,
1988,
Page 477-491
JohnM. Matsoukas,
GrahamJ. Moore,
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摘要:
Fast atom bombardment mass spectrometry (FAB-MS) and high resolution (400 Mz) proton nuclear magnetic resonance (NMR spectroscopy) on the competitive angiotensin II antagonist, |Sar1, Tyr(Me)4(ANGII (Sarmesin) and its he-ptapeptide homolog, [Tyr(Me)3|ANGIII, yield spectra which provide confirmation of structure and molecular weight. The characteristics of the spectra are discussed and compared with the spectra of natural ANG II, ANG III and |Sar1|ANG II. The NMR data are suggestive of interactions in angiotensin between: 1) the phenolic hydroxyl group and the imidazole ring, and 2) the N-terminal amino group and the Tyrring. These interactions may be important for the formation of the proposed charge transfer system in angiotensin II involving the phenoxyl and α-carboxylate groups.
ISSN:0038-7010
DOI:10.1080/00387018808082323
出版商:Taylor & Francis Group
年代:1988
数据来源: Taylor
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