scholarly journals Synthesis, crystal structure and investigation of mononuclear copper(II) and zinc(II) complexes of a new carboxylate rich tripodal ligand and their interaction with carbohydrates in alkaline aqueous solution

2015 ◽  
Vol 149 ◽  
pp. 25-38 ◽  
Author(s):  
Christopher D. Stewart ◽  
Mayra Pedraza ◽  
Hadi Arman ◽  
Hua-Jun Fan ◽  
Eduardo Luiz Schilling ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Tripodal Ligand ◽  
Alkaline Aqueous Solution

Bioanorganische Modellkomplexe für Metalloproteine des Eisen(III) und Mangan(III): Synthese, Magnetismus und Kristallstrukturen von [L2Fe2(acac)2(μ-O)](ClO4)2, [L'Mn(acac)(OC2H5)]BPh4 und [L'Mn(acac)(OH2)](ClO4)2 (L = 1,4,7-Triazacyclononan, L' = N,N',N"-Trimethyl-1,4,7-triazacyclononan)

1988 ◽  
Vol 43 (9) ◽  
pp. 1184-1194 ◽  
Author(s):  
Karl Wieghardt ◽  
Klaus Pohl ◽  
Ursula Bossek ◽  
Bernhard Nuber ◽  
Johannes Weiss
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
High Spin ◽  
Electronic Configuration ◽  
Water Mixture ◽  
Analogous Reaction ◽  
Alkaline Aqueous Solution ◽  
Acetone Water ◽  
Hydrolysis Of

Abstract The reaction of Fe(acac)3 (acac = acetylacetonate, 2,4-pentanedionate) with 1,4,7-triazacyclo- nonane (L) in acetone in the presence of water and NaClO4 yields green crystals of [L2Fe2III(acac)2(μ-O)](ClO4)2 (1) a μ-oxo bridged dimer of Fe(III) the crystal structure of which has been determined. Hydrolysis of this material in an acetone/water mixture in the presence of NaBr yields the green tetramer [L4Fe4III(μ-O)2(μ-OH)4]Br4 · 4H2O. Both compounds are strongly intramolecularly antiferromagnetically coupled. In contrast, the analogous reaction of Mn(acac)3 with L or N,N',N"-trimethyl-1,4,7-triazacyclononane (L') in ethanol or methanol yields yellow- green monomeric complexes of the type [LMnIII(acac)(OR)]+ or [L'Mn(acac)(OR)]+ (R = CH3, C2H5) which were isolated as tetraphenylborate or hexafluorophosphate salts. The crystal struc­ture of [L'Mn(acac)(OC2H5)]BPh4 (2) has been determined. If to the above reaction mixture cone. HClO4 was added, red [L'Mn(acac)(H2O)](CLO4)2 (3) precipitated. In alkaline aqueous solution [L'Mn(acac)(OH)]+ prevails. The crystal structure of 3 has also been determined. The new monomeric manganese(III) complexes have temperature independent (100-300 K) mag­netic moments of 4.8 to 5.1 μB in agreement with a high spin (d4) electronic configuration.

Unusual π-π interactions directed by [{(C6H6)Ru}2W8O30(OH)2]6– hybrid anion

CrystEngComm ◽  
2021 ◽  
Author(s):  
Anna A Mukhacheva ◽  
Vladislav Komarov ◽  
Vasily Kokovkin ◽  
Alexander S. Novikov ◽  
Pavel A Abramov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Building Block ◽  
Π Interactions

The [{(C6H6)Ru}2W8O30(OH)2]6– hybrid (organometallic-POM) anion was used as a pH-tunable building block to create special conditions for realizing π-π interactions in the crystal structure. Changing pH of aqueous solution of...

A new three-dimensional anionic cadmium(II) dicyanamide network

2014 ◽  
Vol 70 (11) ◽  
pp. 1054-1056 ◽  
Author(s):  
Qiang Li ◽  
Hui-Ting Wang
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Unit Cell Volume ◽  
Three Dimensional ◽  
Building Blocks ◽  
The Other ◽  
Dimensional Structure ◽  
Cadmium Nitrate ◽  
Nitrate Tetrahydrate ◽  
Anionic Framework

A new cadmium dicyanamide complex, poly[tetramethylphosphonium [μ-chlorido-di-μ-dicyanamido-κ4N1:N5-cadmium(II)]], [(CH3)4P][Cd(NCNCN)2Cl], was synthesized by the reaction of tetramethylphosphonium chloride, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal structure, each CdIIatom is octahedrally coordinated by four terminal N atoms from four anionic dicyanamide (dca) ligands and by two chloride ligands. The dicyanamide ligands play two different roles in the building up of the structure; one role results in the formation of [Cd(dca)Cl]2building blocks, while the other links the building blocks into a three-dimensional structure. The anionic framework exhibits a solvent-accessible void of 673.8 Å3, amounting to 47.44% of the total unit-cell volume. The cavities in the network are occupied by pairs of tetramethylphosphonium cations.

scholarly journals Crystal structure of the new hybrid material bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate

2015 ◽  
Vol 71 (11) ◽  
pp. 1384-1387
Author(s):  
Marwen Chouri ◽  
Habib Boughzala
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Molar Ratio ◽  
Water Molecules ◽  
Site Symmetry ◽  
Two Dimensional ◽  
Slow Evaporation ◽  
Solution Ph

The title compound bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate, (C6H14N2)2[Bi2Cl10]·2H2O, was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH = 1) containing bismuth(III) nitrate and 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. The structure displays a two-dimensional arrangement parallel to (100) of isolated [Bi2Cl10]4−bioctahedra (site symmetry -1) separated by layers of organic 1,4-diazoniabicyclo[2.2.2]octane dications [(DABCOH2)2+] and water molecules. O—H...Cl, N—H...O and N—H...Cl hydrogen bonds lead to additional cohesion of the structure.

scholarly journals Crystal structure of β-D,L-fructose

2015 ◽  
Vol 71 (10) ◽  
pp. o719-o720 ◽  
Author(s):  
Tomohiko Ishii ◽  
Tatsuya Senoo ◽  
Akihide Yoshihara ◽  
Kazuhiro Fukada ◽  
Genta Sakane
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Equimolar Mixture ◽  
Compound C ◽  
Dimensional Network ◽  
Hydroxy Groups

The title compound, C6H12O6, was crystallized from an aqueous solution of equimolar mixture of D- and L-fructose (1,3,4,5,6-pentahydroxyhexan-2-one,arabino-hexulose or levulose), and it was confirmed that D-fructose (or L-fructose) formed β-pyranose with a2C5(or5C2) conformation. In the crystal, two O—H...O hydrogen bonds between the hydroxy groups at the C-1 and C-3 positions, and at the C-4 and C-5 positions connect homochiral molecules into a column along theaaxis. The columns are linked by other O—H...O hydrogen bonds between D- and L-fructose molecules, forming a three-dimensional network.

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