Long-wavelength absorbing derivatives of phycocyanobilin: New structural aspects of phytochrome

1994 ◽  
Vol 4 (21) ◽  
pp. 2517-2522 ◽  
Author(s):  
Ronald Micura ◽  
Karl Grubmayr
Keyword(s):  
Long Wavelength ◽  
Derivatives Of ◽  
Structural Aspects

Poly(methyl-phenylsilylene) Derivatives as Photoconductors

1993 ◽  
Vol 58 (10) ◽  
pp. 2337-2348 ◽  
Author(s):  
Ivan Kmínek ◽  
Stanislav Nešpůrek ◽  
Eduard Brynda ◽  
Jiří Pfleger ◽  
Věra Cimrová ◽  
...  
Keyword(s):  
Spectral Properties ◽  
Long Wavelength ◽  
Langmuir Blodgett ◽  
Ultrathin Layers ◽  
Polar Derivatives ◽  
Derivatives Of

The attachment of long wavelength absorbing π-conjugated chromophores to poly(methyl-phenylsilylene) (PMPSi) via reactions of its formylated derivative is described. Some of the obtained polymers exhibit improved photostability in comparison with the parent polymer. Their spectral properties and photoconductivity are discussed. Ultrathin layers and multilayers were prepared from polar derivatives of PMPSi by the Langmuir-Blodgett technique and their photoconductive behaviour was studied.

Functional group and substituent effects, both steric and electronic, upon the ultraviolet absorption spectra of some N-alkyl- and N,N-dialkyl-derivatives of some cinnamamides and benzalcyanoacetamides

1969 ◽  
Vol 47 (17) ◽  
pp. 3278-3280 ◽  
Author(s):  
A. D. Delaney ◽  
D. J. Currie ◽  
H. L. Holmes
Keyword(s):  
Hydrogen Atom ◽  
Absorption Spectra ◽  
Functional Group ◽  
Substituent Effects ◽  
Ultraviolet Absorption ◽  
Long Wavelength ◽  
Wavelength Absorption ◽  
Derivatives Of

Conjugative and steric constants for N-substituted carboxyamide groups have been derived which allow the calculation of the long wavelength absorption maxima of N-alkyl- and N,N-dialkyl-derivatives of cinnamamide and benzalcyanoacetamide. Deviations between calculated and observed values indicate that there may be steric interference between bulky N,N-dialkylcarboxyamide groups and the benzylic hydrogen atom.

Synthetic Studies and Structural Aspects of some Metallacyclic Derivatives of Titanium (IV) - Better Precursors for Titania

2012 ◽  
Vol 584 ◽  
pp. 411-414 ◽  
Author(s):  
Madhvesh Pathak ◽  
Blassan Samuel ◽  
Kiran Tummalapalli ◽  
Prasanth Vuppalapati Giri ◽  
Rakesh Bohra ◽  
...  
Keyword(s):  
High Yield ◽  
Chemical Analyses ◽  
Molar Ratios ◽  
Octahedral Environment ◽  
Physico Chemical ◽  
Synthetic Studies ◽  
Derivatives Of ◽  
Structural Aspects

Titanium(IV) complexes of the type [(acac)2Ti(O-G-O] and [(acac)2Ti(OCH2CH2SH)2] {where G = (CH2)2, CH2CH(CH3), CH2CH(C2H5), CH(CH3)CH(CH3) have been synthesized in high yield by the interaction of the precursor [(acac)2Ti( OR)2] {where R = Pri , Et} with a variety of glycols and thioglycols in 1:1 and 1:2 molar ratios in refluxing benzene under anhydrous condition yield heteroleptic derivatives. On the basis of physico-chemical analyses, a cis-octahedral environment around Ti (IV) is proposed.

scholarly journals Elastic Behaviour of Terbium Metaphosphate Glasses Under High Pressures

1994 ◽  
Vol 47 (6) ◽  
pp. 795 ◽  
Author(s):  
HB Senin ◽  
HAA Sidek ◽  
GA Saunders
Keyword(s):  
Hydrostatic Pressure ◽  
High Pressures ◽  
Uniaxial Stress ◽  
Elastic Stiffness ◽  
Acoustic Mode ◽  
Elastic Behaviour ◽  
Third Order ◽  
Long Wavelength ◽  
Two Level Systems ◽  
Derivatives Of

The elastic and nonlinear acoustic vibrational properties of terbium metaphosphate glasses (Tb2O3)x(P2O5)1?x with x = 0�226,0�247,0�263 and 0�271 (x is the mole fraction) have been determined from measurements of the effects of temperature, hydrostatic pressure, and uniaxial stress on' ultrasonic wave velocity. At temperatures below about 140 K, the elastic stiffness of' (Tb2O3)x(P2O5)1?x glasses becomes anomalously dependent upon temperature, a behaviour usually associated with interactions between acoustic phonons and two-level systems. Except for the (Tb2O3)0�271(P205)0�729 glass, the hydrostatic pressure derivatives of the elastic stiffness and also of the bulk modulus BS of terbium metaphosphate glasses are small and negative. The third-order elastic stiffness tensor components CIJK of the (Tb2O3)0�247(P2O5)0�753 glass between 77 K and 400 K have also been determined. At room temperature, C112, C123 and C144 are positive while C111, C155 and C456 are negative. Both longitudinal and shear acoustic mode Gr�neisen parameters are small and negative: the application of pressure softens the long-wavelength acoustic phonon mode frequencies. The mode softening is enhanced as the temperature is reduced.

Tellurium derivatives of 3-acetyl-2,5-dimethylthiophene: Synthetic and structural aspects

2013 ◽  
Vol 728 ◽  
pp. 44-51 ◽  
Author(s):  
Poornima Singh ◽  
Ashok K.S. Chauhan ◽  
Ray J. Butcher ◽  
Andrew Duthie
Keyword(s):  
Derivatives Of ◽  
Structural Aspects

Abbau und Toxizität von Hexachlorbicyclo [2.2.1]-hept-5-en- Derivaten (Cyclodien-Insektizide) / Structural Aspects of Biological Conversion and Toxicity of Hexachloro-norbornene Derivatives (Cyclodiene-Insecticides)

1973 ◽  
Vol 28 (3-4) ◽  
pp. 107-112 ◽  
Author(s):  
W. Rückert ◽  
K. Ballschmiter
Keyword(s):  
Molecular Structure ◽  
Musca Domestica ◽  
Oxidative Metabolism ◽  
House Fly ◽  
Piperonyl Butoxide ◽  
Biological Conversion ◽  
Cyclodiene Insecticides ◽  
Derivatives Of ◽  
Norbornene Derivatives ◽  
Structural Aspects

The aspects of molecular-structure and biological conversion have been studied for 12 derivatives of the endosulfan ether 1 [4, 5, 6, 7, 8, 8- hexachloro- 1, 3, 3a, 4, 7, 7a- hexahydro- 4, 7-methanoisobenzofuran]. Adults of a normal house-fly strain (Musca domestica) have been used in the assay. Derivatives of 1 monosubstituted in position I are found to be converted substantially faster than products disubstituted in position I and 3, respectively. Metabolism is inhibited for all compounds studied after application of piperonyl butoxide as a synergist. Besides proving that on oxidative metabolism has to be discussed and in fact could be proved for some derivatives, the intrinsic toxicity of the compounds studied shows up under these conditions. Some derivatives known to be metabolites of the pesticide Endosulfan® show a high intrinsic toxicity to houseflies if the oxidative metabolism is inhibited.

Ciprofloxacin salts with benzoic acid derivatives: structural aspects, solid-state properties and solubility performance

CrystEngComm ◽  
2020 ◽  
Vol 22 (25) ◽  
pp. 4238-4249
Author(s):  
Artem O. Surov ◽  
Nikita A. Vasilev ◽  
Alexander P. Voronin ◽  
Andrei V. Churakov ◽  
Franziska Emmerling ◽  
...  
Keyword(s):  
Solid State ◽  
Benzoic Acid ◽  
Analytical Techniques ◽  
Benzoic Acid Derivatives ◽  
Derivatives Of ◽  
Structural Aspects

In this work, three new pharmaceutical hydrated salts of ciprofloxacin with selected derivatives of benzoic acid were obtained and systematically investigated by several solid-state analytical techniques.

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