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Complex formation reactions of palladium(II)-1,3-diaminopropane with various biologically relevant ligands. Kinetics of hydrolysis of glycine methyl ester through complex formation

100%
El-Sherif A., Shoukry M., El-Bahnasawy R., Ahmed D.
Open Chemistry
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2010
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vol. 8
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issue 4
919-927
EN
The interaction of [Pd(DAP)(H2O)2]2+ (DAP = 1,3-diaminopropane) with some selected bio-relevant ligands, containing different functional groups, were investigated. The ligands used are dicarboxylic acids, amino acids, peptides and DNA constituents. Stoichiometry and stability constants of the complexes formed are reported at 25°C and 0.1 M ionic strength. The results show the formation of 1:1 complexes with amino acids and dicarboxylic acids. The effect of chelate ring size of the dicarboxylic acid complexes on their stability constants is examined. Peptides form both 1:1 complexes and the corresponding deprotonated amide species. DNA constituents form 1:1 and 1:2 complexes. The effect of dioxane on the acid dissociation constants of CBDCA and the formation constant of its complex with Pd(DAP)2+ was reported. The kinetics of hydrolysis of glycine methyl ester bound to [Pd(DAP)(H2O)2]2+ was studied at 25°C and 0.1M ionic strength. [...]
2
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L-alaninium perrhenate: crystal structure and non-linear optical properties

88%
Rodrigues V., Costa M., Gomes E., Isakov D., Belsley M.
Open Chemistry
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2014
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vol. 12
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issue 10
1016-1022
EN
The crystal structure and non-linear optical properties of L-alaninium perrhenate, C3H8NO2+ ReO4 −, are reported. The protonated amino acid and the perrhenate anion have their usual geometries. The three-dimensional hydrogen-bonded network can be seen as a stacking of layers parallel to the (100) planes. Each layer is formed by chains of alternating positive and negative ions along the b and c axes. Hydrogen bonding of adjacent layers forms alternating chains along the a axis. A high damage threshold and a second-harmonic generation efficiency three times that of KDP make this new material potentially useful in non-linear optics.
3
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Functionalised, chiral imidazolium compounds from proteinogenic amino acids

88%
Kühl O., Millinghaus S., Wehage P.
Open Chemistry
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2010
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vol. 8
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issue 6
1223-1226
EN
Chiral, carboxylic acid-functionalised imidazolium zwitterions were synthesised from the corresponding L-amino acids leucine, valine and isoleucine.
4
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Altered membrane amino acids composition in human colorectal cancer tissue

88%
Szachowicz-Petelska B., Sulkowski S., Figaszewski Z.
Open Chemistry
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2012
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vol. 10
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issue 4
1245-1252
EN
Cancer transformation is characterized by changes in cell metabolism, which can alter the structure and function of cell membrane components, including integral membrane proteins. Qualitative and quantitative estimations of integral membrane protein are necessary for studies aimed at understanding their modifications under pathological conditions. Herein, we used a high-performance liquid chromatography (HPLC)-based approach that involved selective hydrolysis of isolated tissue cell membrane proteins to peptides, resolution by chromatography and determination of the amino acid content (phenylalanine (Phe), tyrosine (Tyr), cysteine (Cys) and lysine (Lys)) in individual peptides. The results demonstrate decrease in peptide levels and their amino acids content in integral membrane proteins in human colorectal cancer tissue. Therefore, cancer transformation causes a decrease in the levels of integral membrane proteins, which may in turn lead to an increase in the levels of other charged molecules on the cell surface, such as phospholipids. It might lead to the reconstruction and functional rearrangement of the cell membrane, for example: the permeability, electric properties, fluidity etc. [...]
5
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Adsorption of cystine at mercury/ aqueous solution of chlorate (VII) interface in solutions of different water activity

88%
Nosal-Wiercińska A.
Open Chemistry
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2012
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vol. 10
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issue 4
1290-1300
EN
[...]
6
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Solvent-controlled diastereoselectivity in tryptophan-catalyzed Mannich reactions

63%
Valero G., León C. M., Moyano A.
Asymmetric Catalysis
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2015
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vol. 2
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issue 1
EN
Solvent effects in the L-tryptophan-catalyzed Mannich reaction between hydroxyacetone and glyoxylate imines have been examined. The use of a DMSO/1-butanol (4:1 v/v) mixture as solvent at rt provided the expected Mannich adducts in good yields, high anti-diastereoselectivity (up to 10.3:1 anti/syn ratio) and excellent enantioselectivities (up to >99.9% ee for the anti isomer).
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