摘要:

The Infrared and Raman spectra of 4-Phenylpyridine are reported for the first time in the 4000-400cm−1range. Vibrational assignments have been made for fundamental modes on the basis of frequency shifts of coordinated legend, infrared and Raman band contours and comparisons with the assignments for related molecules. The infrared spectra of M (4-Phenylpyridine) Ni(CN)4complexes (M=Mn, Ni or Cd) are reported. Their structure consists of polymeric layers of [M-Ni(CN)4]∞with the 4-phenylpyridine molecules bound to metal (M), similar to the structure found in Hoffmann type host complexes.

ISSN:0038-7010    

DOI:10.1080/00387019408006967

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The three isonicotinoyl hydrazone Schiff bases viz. anisaldehyde isonicotinoyl hydrazone(AINH), 2-furaldehyde isonicotinoyl hydrazone(FINH), 2-thi ophenealdehyde isonicotinoyl hydrazone(TINH) have been synthesized and characterized on the basis of their elemental analysis, magnetic susceptibility, IR, electronic and nmr spectral studies. The ternary complexes of Ni(II) and Cu(II) with these hydrazones and neutral bidentate base phen and bipy are octahedral and the presence of acetate and/ or water molecule is revealed by the study of their IR spectra, force constants and thermal degradation pattern. Suitable structures have been assigned to these ternary complexes.

ISSN:0038-7010    

DOI:10.1080/00387019408006968

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Absorption and fluorescence wavelengths for a series of a lactones have been measured from acetonitrile solutions that had no pre-light exposure. Fluorescence quantum yields, Qp are found to be in general less than 0.01, excluding the the derivatives with naphthyl andp-dimethylaminophenyl substituents. Previously reported QFvalues did not not fit to our results.

ISSN:0038-7010    

DOI:10.1080/00387019408006969

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The spectral characteristics of thiamine hydrochloride in the absence and presence ofβ–-cyclodextrin (β–-CD) have been investigated to reveal the nature of the non covalent interaction of the cyclodextrin system. It is indicated that Fourier transform infrared (FTIR) spectrometry could provide a unique and sensitive technique for the detection of microenvironment changes in solutions of the guest, which is especially important in the cases like the weak interaction between thiamine hydrochloride andβ–-CD, where other spectroscopic data lack of distinct changes.

ISSN:0038-7010    

DOI:10.1080/00387019408006970

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The aim of this work was to check the possibility that by use of infrared spectroscopy the influence of fluorides on the calcinations process of aluminum hydroxide can be followed. The DTA method shows it clearly. It was, namely, found that the added fluoride influences the process of polymorphous transformation of the formation of α-Al2O3from Al(OH)3. According to DTA, IR, and X-ray analyses, it was found that the added fluoride lowers the temperature of the mentioned transformation for some 300 degrees.

ISSN:0038-7010    

DOI:10.1080/00387019408006971

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Gossypol and its 1: 1 complexes with copper acetate in acetonitrile were studied by FTIR and UV-visible spectroscopy. With the complexation with Cu cation the tautomeric equilibrium of gossypol is completely shifted from the aldehyde-aldehyde to the lactol-lactol tautomer. The acidic character of O11H group in the gossypol-Cu complex led to the selective esterification of the lactol form of gossypol by the acetate group.

ISSN:0038-7010    

DOI:10.1080/00387019408006972

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Seven siderophores which differ from salicylaldehyde benzoyl hydrazone by only one substituent on the benzoyl moiety are studied with infrared Spectroscopy between 2000 and 1100 cm−1. The shift of the amide-I band and the intensity variations of cycle stretching bands are specially discussed according to the nature of the substituents.

ISSN:0038-7010    

DOI:10.1080/00387019408006973

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In the two stable conformations of the diazabicyclanol 3, 7-dimethyl-3, 7-diazabicyclo[3. 3. 1]nonan-9-ol,chair-chair(Va) andchair-boat(Vb), the infrared spectra (200–4000 cm−1) were recorded, compared and their vibrations analysed. Using the AMI senlempirical method, the geometry was fully optimized in both forms, and the theoretical Infrared spectra were calculated and compared. In the (Vb) conformation, the IR spectra were recorded in CCl3D, CCl4and S2C solvents. Some correlations were established.

ISSN:0038-7010    

DOI:10.1080/00387019408006974

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The first study on the infrared spectroscopy of the bis(amidinohydrazones) of various glyoxals is reported. The compounds studied include the antileukemic agents glyoxal bis(amidinohydrazone) and methylglyoxal bis(amidinohydrazone) (Mitoguazone) as well as seven mono-and dialkylglyoxal analogues thereof. Free bases as well as doubly protonated species (divalent salts) were investigated. Selectively deuterated analogues were also studied and were synthesized by exchanging nitrogen-bound hydrogen atoms for deuterium atoms. The effects of substituents, protonation and deuteration on the FT-IR spectra of the compounds are discussed.

ISSN:0038-7010    

DOI:10.1080/00387019408006975

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Evaluation by empirically derived equations for the Substituent effect (α, β, γ, δ) on the13C NMR chemical shifts for C-3, C-4. C-5 and halomethyl-substituent carbon (C-6) in isoxazoles 1-5 [where C-3 substituent (R1) = H, alkyl or phenyl, C-4 Substituent (R2) = H, alkyl, and C-5 substituent (R3) = di-or trihalomethyl, methyl and H], taking as reference the compound la, is reported. From the calculated values for the α, β, γ, δ effects for each substituent it was possible to estimate the chemical shift of each carbon of the compounds 1–5. The13Cchemical shifts of the C-3, C-4, C-5, C-6 of these compounds, can be estimated with good precision: 94% of the calculated chemical shifts are found to be within ±1.0ppm, and 100% are found to be within ±1.5ppm.

ISSN:0038-7010    

DOI:10.1080/00387019408006976

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor