Vibrational and electronic spectra of new liposoluble metalloporphyrins in a nonpolar noncoordinating solvent

1991 ◽  
Vol 69 (7) ◽  
pp. 1070-1079 ◽  
Author(s):  
Michel Ringuet ◽  
Denis Girard ◽  
Camille Chapados
Keyword(s):  
Experimental Data ◽  
Infrared Spectroscopy ◽  
Structural Characteristics ◽  
Electronic Spectroscopy ◽  
Far Infrared ◽  
Covalent Radius ◽  
Far Infrared Spectroscopy ◽  
Normal Coordinate ◽  
Vibrational Bands ◽  
Far Infrared Spectra

A new liposoluble porphyrin, 2,7,12,17-tetrahexyl-3,8,13,18-tetramethylporphin(THTMP), and its complexes with divalent (Mg, Co, Ni, Cu, Zn, Cd, Hg) and trivalent (Mn, Fe) metals have been synthesized. The electronic, infrared, and far-infrared spectra of these compounds were obtained in the same nonpolar, noncoordinating solvent, CCl4. After comparison with the experimental data and the results of normal coordinate analyses from the literature, the assignment of the vibrational bands of THTMP and its complexes is made. Some correlations between the shifts of the metal sensitive bands in the diffferent regions and the structural characteristics of the porphyrin complexes are reported. Some emphasis is made on the magnesium complex in relation to chlorophyll. Key words: Metalloporphyrin, porphyrin, infrared spectroscopy, far-infrared spectroscopy, electronic spectroscopy, nitrogen-metal bond, covalent radius, reduced mass.

Fourier transform far-infrared spectroscopy of HN2+ on the AILES beamline of synchrotron SOLEIL

2013 ◽  
Vol 91 (11) ◽  
pp. 937-940 ◽  
Author(s):  
S. Gruet ◽  
A. Morvan ◽  
O. Pirali ◽  
T. Chamaillé ◽  
E. Bouisset ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Broad Band ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Pure Rotation ◽  
Frequency Tunable ◽  
Discharge Cell ◽  
Rotation Spectrum ◽  
Far Infrared Spectra

We report the pure rotation spectrum of HN2+ as measured by Fourier transform (FT) absorption spectroscopy in the 20–40 cm−1 spectral range. The cations are produced in a liquid nitrogen cooled hollow cathode discharge cell developed on the AILES beamline of synchrotron SOLEIL. The setup was optimized by recording rotation–vibration spectra of H3+ (with the ν2 band centered at about 2521 cm−1), HN2+ (with the ν1 band centered at about 3234 cm−1), and HCO+ (with the ν1 band centered at about 3089 cm−1). Many rotation–vibration lines have been assigned for each ion and five pure rotational transitions have been detected for HN2+. These results demonstrate the feasibility of recording far-infrared spectra of cationic species using FT broad band spectroscopy associated with the bright synchrotron radiation continuum as an alternative to laser-based frequency tunable techniques.

Synthesis, Structures and Spectroscopic Properties of 1 : 1 Complexes of Gold(I) Halides with Trimesitylphosphine

2000 ◽  
Vol 53 (3) ◽  
pp. 175 ◽  
Author(s):  
Raymond C. Bott ◽  
Graham A. Bowmaker ◽  
Robbie W. Buckley ◽  
Peter C. Healy ◽  
M. C. Senake Perera
Keyword(s):  
Infrared Spectroscopy ◽  
Solid State ◽  
Far Infrared ◽  
Spectroscopic Properties ◽  
Far Infrared Spectroscopy ◽  
Space Group ◽  
X Ray ◽  
Bond Lengths ◽  
Structure Determinations ◽  
Far Infrared Spectra

Monomeric two-coordinate gold(I) complexes, [Au(P(mes)3)X] (P(mes)3 = tris(2,4,6-trimethylphenyl)phosphine, X = Cl, Br and I), have been prepared and characterized by single-crystal X-ray structure determinations, far-infrared spectroscopy and solution and solid-state CPMAS 31 P n.m.r. spectroscopy. X-Ray structure determinations show that crystals obtained from solutions of [NBu4] [AuX2] and P(mes)3 in acetonitrile for X = Cl, Br and I and in dimethylformamide (dmf) for X = Br and I form an isomorphous series of complexes, crystallizing in space group P21/c with a ª 8, b ª 22, c ª 13 Å, b ª 98˚ (a form). Crystallization of the chloride from dimethylformamide yields the solvated complex [Au(P(mes)3)X]·(dmf) in space group P2/a with a 15.224(2), b 10.070(1), c 18.210(4) Å, b 100.42(2)˚. Electrochemical synthesis of the complexes for X = Cl and Br yield two new crystalline phases; the chloride in space group P21/c with a 10.249(2), b 8.189(2), c 31.844(3) Å, b 91.68(1)˚ (b form) and the bromide in space group Pbca with a 19.208(4), b 15.586(3), c 16.962(4) Å ( g form). The Au–P bond lengths increase in the order Cl < Br < I with distances c. 0.02–0.03 Å longer than average values for other [Au(PR3)X] complexes, reflecting steric congestion by the P(mes)3 ligand. For the unsolvated complexes, the Au–X distances are c. 0.02 Å shorter than average values. For the Cl/dmf solvate, both Au–P and Au–X bond lengths increase. For the a complexes, far-infrared spectra show n(Au 35,37 Cl) 336, 329 cm –1 , n(AuBr) 234 cm –1 and n(AuI) 195 cm –1 and solid-state 31 P CPMAS n.m.r. spectra yield broad peaks with d–3.9 (Cl), –0.6 (Br) and +6.0 I). For the Cl/dmf solvate, n(Au 35,37 Cl) are 334, 327 cm –1 and d is –4.4. Solution 31 P n.m.r. spectra in CDCl3 give sharp single peaks at d –5.0 (Cl), –1.4 (Br) and +5.5 (I) with the similarity of the values with those for the solid-state spectra consistent with similar conformational structures for the [Au(P(mes)3)X] molecules in the two states.

Complexes of Cobalt(II), Nickel(II), And Copper Acetates, Perchlorates, and Tetrafluoroborates with Heterocyclic Ligands Containing Va and Via Group Donor Atoms

1975 ◽  
Vol 53 (2) ◽  
pp. 177-185 ◽  
Author(s):  
C. Preti ◽  
G. Tosi
Keyword(s):  
Infrared Spectroscopy ◽  
Metal Ion ◽  
Electronic Spectroscopy ◽  
Far Infrared ◽  
Heterocyclic Ligands ◽  
Free Ions ◽  
Nitrogen Donor ◽  
Molecular Conductance ◽  
Far Infrared Spectra ◽  
Metal Ligand

Cobalt(II), nickel(II), copper(II), and copper(I) acetate, perchlorate, and tetrafluoroborate complexes with thiazolidine-2-thione, thiomorpholin-3-one, and thiomorpholin-3-thione have been prepared. On the basis of infrared and far infrared spectra, electronic spectroscopy, magnetism, and molecular conductance, the stereochemistries of these complexes were identified. Assignments for the metal–ligand modes have also been made. By the use of infrared spectroscopy it has been possible to distinguish whether or not the polyanions present in the complexes are coordinated to the transition metal ion or are present as free ions. Spectroscopic parameters for the complexes have been calculated and compared with similar chromophores containing sulfur, oxygen, and nitrogen donor atoms.

scholarly journals Intermolecular Hydrogen-Bond Interactions in DPPE and DMPC Phospholipid Membranes Revealed by Far-Infrared Spectroscopy

2021 ◽  
Vol 11 (21) ◽  
pp. 10038
Author(s):  
Valeria Conti Nibali ◽  
Caterina Branca ◽  
Ulderico Wanderlingh ◽  
Giovanna D’Angelo
Keyword(s):  
Hydrogen Bond ◽  
Infrared Spectroscopy ◽  
Intermolecular Hydrogen Bond ◽  
Far Infrared ◽  
Infrared Region ◽  
Frequency Region ◽  
Far Infrared Spectroscopy ◽  
Intermolecular Hydrogen Bonds ◽  
Hydrogen Bond Interactions ◽  
Vibrational Bands

The vibrational signature in the far-infrared region of two different phospholipids, phosphatidylcholine (PC) and phosphatidylethanolamine (PE), was investigated as a function of relative humidity from 0 to 75% in order to evaluate the effect of headgroup composition on the formation of intermolecular interactions. The substructures of the frequency region between 50 and 300 cm−1 were identified, and changes in the frequency and intensity of the related vibrations with hydration were analyzed. Interestingly, in PE, two additional vibrational bands with respect to PC were found at 162 and 236 cm−1 and assigned to intermolecular hydrogen bonds between the hydrogen-bond-donating groups, -NH3+, and hydrogen-bond-accepting groups, —P—O− and —COO, of adjacent molecules. The presence of these interactions also affected the penetration of water, severely reducing the hydration capability of PE lipids.

Comparative mid- and far-infrared spectroscopy of nitrogen–oxygen complexes in silicon

2009 ◽  
Vol 404 (23-24) ◽  
pp. 4549-4551
Author(s):  
H.Ch. Alt ◽  
H.E. Wagner
Keyword(s):  
Infrared Spectroscopy ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Oxygen Complexes

Far-Infrared Spectroscopy of Diffuse Interstellar Medium - Large Silicon Abundance and Effects of UV Radiation

2002 ◽  
Vol 4 ◽  
pp. 303-303
Author(s):  
T. Onaka ◽  
Y. Okada ◽  
M. Mizutani ◽  
Y. Doi ◽  
H. Shibai
Keyword(s):  
Infrared Spectroscopy ◽  
Interstellar Medium ◽  
Uv Radiation ◽  
Far Infrared ◽  
Far Infrared Spectroscopy

scholarly journals Synchrotron-Based High Resolution Far-Infrared Spectroscopy of trans-Butadiene

2020 ◽  
Vol 124 (12) ◽  
pp. 2427-2435 ◽  
Author(s):  
Marie-Aline Martin-Drumel ◽  
Jessica P. Porterfield ◽  
Manuel Goubet ◽  
Pierre Asselin ◽  
Robert Georges ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
High Resolution ◽  
Far Infrared ◽  
Far Infrared Spectroscopy

Tunable Far-Infrared Spectroscopy of HF, H35Cl, and H37Cl in the 6 to 9 THz Region

1999 ◽  
Vol 194 (2) ◽  
pp. 283-284 ◽  
Author(s):  
Hitoshi Odashima ◽  
Lyndon R. Zink ◽  
K.M. Evenson
Keyword(s):  
Infrared Spectroscopy ◽  
Far Infrared ◽  
Far Infrared Spectroscopy
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