scholarly journals Preparation, Spectrochemical, and Computational Analysis of L-Carnosine (2-[(3-Aminopropanoyl)amino]-3-(1H-imidazol-5-yl)propanoic Acid) and Its Ruthenium (II) Coordination Complexes in Aqueous Solution

Molecules ◽  
2011 ◽  
Vol 16 (12) ◽  
pp. 10269-10291 ◽  
Author(s):  
Michael Lee Branham ◽  
Parvesh Singh ◽  
Krishna Bisetty ◽  
Myalo Sabela ◽  
Thirumala Govender
Keyword(s):  
Aqueous Solution ◽  
Computational Analysis ◽  
Coordination Complexes ◽  
Propanoic Acid

scholarly journals Controlling the Reduction of Chelated Uranyl to Stable Tetravalent Uranium Coordination Complexes in Aqueous Solution

2020 ◽  
Author(s):  
Korey P. Carter ◽  
Kurt F. Smith ◽  
Toni Tratnjek ◽  
Gauthier J.-P. Deblonde ◽  
Liane M. Moreau ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Coordination Complexes ◽  
Tetravalent Uranium

Bioconjugatable synthetic chlorins rendered water-soluble with three PEG-12 groups via click chemistry

2020 ◽  
Vol 24 (01n03) ◽  
pp. 362-378 ◽  
Author(s):  
Nobuyuki Matsumoto ◽  
Masahiko Taniguchi ◽  
Jonathan S. Lindsey
Keyword(s):  
Aqueous Solution ◽  
Quantum Yield ◽  
Click Chemistry ◽  
Fluorescence Quantum Yield ◽  
Molecular Design ◽  
Water Soluble ◽  
Propanoic Acid ◽  
Free Base ◽  
Yield Formula ◽  
Water Solubilization

Chlorins provide many ideal features for use as red-region fluorophores but require molecular tailoring for solubilization in aqueous solution. A chlorin building-block bearing 18,18-dimethyl, 15-bromo and 10-[2,4,6-tris(propargyloxy)phenyl] substituents has been transformed via click chemistry with CH3(OCH2CH[Formula: see text]-N3 followed by Suzuki coupling with 3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoic acid, thereby installing a water-solubilization motif and a bioconjugatable handle, respectively. In toluene, [Formula: see text]-dimethylformamide (DMF) or water, the resulting facially encumbered free base chlorin exhibits characteristic chlorin absorption ([Formula: see text] [Formula: see text]412, 643 nm) and fluorescence ([Formula: see text] [Formula: see text]645 nm) spectra with only modest variation in fluorescence quantum yield ([Formula: see text] values (0.24, 0.25 and 0.19, respectively). The zinc chlorin derived therefrom exhibits similar spectral constancy ([Formula: see text] [Formula: see text]414 and 613 nm, [Formula: see text] [Formula: see text]616 nm) and [Formula: see text] 0.094, 0.10 and 0.086 in the three solvents. The results together indicate the viability of the molecular design and synthetic methodology to create red-region fluorophores for use in diverse applications.

Coordination Complexes of Indium and 2,2',2'-Terpyridyl and of Indium and 5-Nitro-1,10-phenanthrolin

1951 ◽  
Vol 4 (4) ◽  
pp. 651
Author(s):  
GJ Sutton
Keyword(s):  
Aqueous Solution ◽  
Coordination Complexes ◽  
Soluble Salt

Indium ions react with 2,2?,2"-terpyridyl in dilute alcohol or in aqueous solution forming bisterpyridyl indium salts, of which the chloride, bromide, iodide, and thiocyanate are insoluble. As thiocyanate, one part of indium per lo5 may be detected. Metals such as zinc, tin, and iron, with which indium is usually associated, interfere with the reaction. With 5-nitro-1,lO-phenanthroline, indium forms insoluble tris-(5-nitro-1,10-phenanthroline) indium salts as chloride, bromide, iodide, and thiocyanate. The reactions are of little value since the least soluble salt, the iodide, is 0.04 per cent. soluble.

scholarly journals Stability Constants of Mixed Ligand Complexes of Nickel(II) with Adenine and Some Amino Acids

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Naciye Türkel
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Ternary Complex ◽  
Coordination Complexes ◽  
Ternary Complexes ◽  
Mixed Ligand ◽  
Relative Stabilities ◽  
Binary And Ternary Complexes ◽  
Binary Complexes ◽  
Essential Trace Elements

Nickel is one of the essential trace elements found in biological systems. It is mostly found in nickel-based enzymes as an essential cofactor. It forms coordination complexes with amino acids within enzymes. Nickel is also present in nucleic acids, though its function in DNA or RNA is still not clearly understood. In this study, complex formation tendencies of Ni(II) with adenine and certain L-amino acids such as aspartic acid, glutamic acid, asparagine, leucine, phenylalanine, and tryptophan were investigated in an aqueous medium. Potentiometric equilibrium measurements showed that both binary and ternary complexes of Ni(II) form with adenine and the above-mentioned L-amino acids. Ternary complexes of Ni(II)-adenine-L-amino acids are formed by stepwise mechanisms. Relative stabilities of the ternary complexes are compared with those of the corresponding binary complexes in terms ofΔlog10⁡K,log10⁡X, and % RS values. It was shown that the most stable ternary complex is Ni(II):Ade:L-Asn while the weakest one is Ni(II):Ade:L-Phe in aqueous solution used in this research. In addition, results of this research clearly show that various binary and ternary type Ni(II) complexes are formed in different concentrations as a function of pH in aqueous solution.

The unfolding effects on the protein hydration shell and partial molar volume: a computational study

2016 ◽  
Vol 18 (40) ◽  
pp. 28175-28182 ◽  
Author(s):  
Sara Del Galdo ◽  
Andrea Amadei
Keyword(s):  
Aqueous Solution ◽  
Computational Analysis ◽  
Computational Study ◽  
Hydration Shell ◽  
Partial Molar Volumes ◽  
Globular Proteins ◽  
Protein Hydration ◽  
Native Protein ◽  
Unfolded State ◽  
Protein Hydration Shell

In this paper we apply the computational analysis recently proposed by our group to characterize the solvation properties of a native protein in aqueous solution, and to four model aqueous solutions of globular proteins in their unfolded states thus characterizing the protein unfolded state hydration shell and quantitatively evaluating the protein unfolded state partial molar volumes.

Coordination complexes of Mn(II), Co(II), Ni(II), Zn(II) and Cd(II) with histaminol – Crystal structures and formation constants in aqueous solution

Polyhedron ◽  
2020 ◽  
Vol 178 ◽  
pp. 114328 ◽  
Author(s):  
Piotr Maślewski ◽  
Dariusz Wyrzykowski ◽  
Weronika Kentner ◽  
Anna Ciborska ◽  
Anna Dołęga
Keyword(s):  
Aqueous Solution ◽  
Crystal Structures ◽  
Formation Constants ◽  
Coordination Complexes

Generation of radicals in the charge-transfer photochemistry of coordination complexes of colbalt(III) in aqueous solution

1974 ◽  
Vol 78 (7) ◽  
pp. 686-691 ◽  
Author(s):  
Deborah D. Campano ◽  
Evan R. Kantrowitz ◽  
Morton Z. Hoffman ◽  
Marc S. Weinberg
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Coordination Complexes
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