Unique Coordination Mode of Potassium Ions to Glycyrrhizin: X-ray Crystal Structure of Glycyrrhizin Dipotassium Salt

2009 ◽  
Vol 38 (11) ◽  
pp. 1024-1025 ◽  
Author(s):  
Yasuko In ◽  
Masaru Uchida ◽  
Masamichi Watanabe ◽  
Norio Aimi ◽  
Toshimasa Ishida
Keyword(s):  
Crystal Structure ◽  
Coordination Mode ◽  
Potassium Ions ◽  
X Ray ◽  
Dipotassium Salt

scholarly journals Synthesis and Crystal Structure Differences between Fully and Partially Fluorinated β-Diketonate Metal (Co2+, Ni2+, and Cu2+) Complexes

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Akiko Hori ◽  
Masaya Mizutani
Keyword(s):  
Crystal Structure ◽  
Coordination Mode ◽  
Coordination Complexes ◽  
Protonated Form ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Π Interactions

Coordination complexes, [Co2(1)4(H2O)2] (2), [Ni2(1)4(H2O)2] (3), and [Cu(1)2] (4), by using an asymmetric and partially fluorinated 3-hydroxy-3-pentafluorophenyl-1-phenyl-2-propen-1-one (H1) have been prepared, and the structures were investigated to compare with the corresponding fully fluorinated complexes of [Co2(5)4(H2O)2] (6), [Ni2(5)4(H2O)2] (7), and [Cu(5)2] (8) with bis(pentafluorobenzoyl)methane (H5) and to understand the fluorine-substituted effects. While the coordination mode of the partially fluorinated complexes was quite similar to the fully fluorinated complexes, the intra- and intermolecular π-interactions of the ligand moieties were highly influenced by the fluorination effects; the arene-perfluoroarene interactions were observed in complexes 2 and 3 as a reason of the dinucleation. In this paper, we describe detail structures of the protonated form of the ligand, H1, and complexes 2–4 by X-ray crystallographic studies.

The crystal structure of potassium trichloro(2,6-lutidine)platinum(II)

1976 ◽  
Vol 54 (6) ◽  
pp. 1002-1006 ◽  
Author(s):  
R. Melanson ◽  
F. D. Rochon
Keyword(s):  
Crystal Structure ◽  
Complex Salt ◽  
Platinum Atom ◽  
Potassium Ions ◽  
Distorted Tetrahedron ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Salt Forms ◽  
Coordination Plane

The molecular and crystal structure of potassium trichloro(2,6-lutidine)platinum(II) has been determined by X-ray diffraction. The complex salt forms monoclinic crystals, a = 6.941, b = 24.301, c = 11.168 Å, β = 141.58°, Z = 4, and space group P21/c. Positional and anisotropic thermal parameters were refined by full matrix least squares calculations to R = 0.038 and Rw = 0.034.The coordination around the platinum atom is planar. The Pt—Cl bond lengths are 2.301, 2.299, and 2.302 Å and the Pt—N bond length is 2.011 Å. The 2,6-lutidine ring lies almost perpendicular to the coordination plane of the platinum atom (81.6°). The PtCl3 moieties are packed around the potassium ions, which are surrounded by four chlorine atoms at distances smaller than 3.15 Å forming a distorted tetrahedron.

scholarly journals Isonicotinamide-Based Compounds: From Cocrystal to Polymer

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4169
Author(s):  
Francisco Sánchez-Férez ◽  
Daniel Ejarque ◽  
Teresa Calvet ◽  
Mercè Font-Bardia ◽  
Josefina Pons
Keyword(s):  
Crystal Structure ◽  
Coordination Polymer ◽  
Coordination Mode ◽  
Lattice Energy ◽  
Hirshfeld Surface ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
X Ray ◽  
The One ◽  
2D And 3D

The reaction between [Cu(μ-OAc)(μ-Pip)(MeOH)]2 (1) (OAc = acetate; Pip = 1,3-benzodioxole-5-carboxylate) and isonicotinamide (Isn) in MeOH as solvent yielded two mixture pairs of three compounds: {(HPip)2(Isn) (2), [Cu(Pip)2(Isn)2] (3)} and {(3), {[Cu3(Pip)2(OAc)2(μ-Isn)2(Isn)2(μ-OCH3)2(MeOH)2]·2MeOH}n (4)}. Modifying the reaction conditions (t, T, molar ratio), 2 and 3 have been successfully isolated, whereas 3 and 4 had to be mechanically separated. The recrystallization of 3 in pentanol yielded single crystals of compound [Cu(Pip)2(Isn)2]·C5H11OH (3a). The X-ray crystal structure of 2, 3a, and 4 has been elucidated showing a cocrystal, a monomer, and an unusual coordination polymer, respectively. The Pip ligand exhibited a chelate (3a) or a monodentate (4) coordination mode, but the Isonicotinamide (Isn) ligand is the one that promoted the arrangement of different structures and also mainly directs the formation of the 2D and 3D supramolecular assemblies. All the structures have been analyzed by Hirshfeld surface. In addition, the energy frameworks and lattice energy values of 2 and 3a have been calculated.

Molecular and Crystal Structure of Potassium-L-alaninatodichloridoplatinate( II), K[Pt(L-alaO)Cl2]

2012 ◽  
Vol 67 (8) ◽  
pp. 849-852 ◽  
Author(s):  
Stefan Schiesser ◽  
Peter Mayer ◽  
Thomas Carell ◽  
Wolfgang Beck
Keyword(s):  
Crystal Structure ◽  
Planar Structure ◽  
Molecular And Crystal Structure ◽  
Potassium Ions ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar

The square-planar structure of the [Cl2Pt(alaninate)]- anion was determined by X-ray crystallography. In the crystal structure the packing of the components is dominated by layers of potassium ions

scholarly journals The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1669
Author(s):  
Ronja Jordan ◽  
Doris Kunz
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Nmr Spectroscopy ◽  
Carbon Atom ◽  
Coordination Mode ◽  
Alkyl Chain ◽  
Crystal Structure Analysis ◽  
Pincer Ligand ◽  
X Ray ◽  
Central Carbon

The coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimcaC5) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging coordination mode is found for the lithium complex. With the larger and softer potassium ion, the ligand adopts a facial coordination mode and a polymeric structure by intermolecular potassium nitrogen interactions. The facial coordination is also confirmed at a Cp*Ru fragment, while C-H activation under dehydrogenation at the alkyl chain is observed upon reaction with [Ru(PPh3)3Cl2]. In contrast, Pd(OAc)2 reacts under C-H activation at the central carbon atom of the pentamethylene tether to an alkyl-pincer macrocycle.

Reactions of Fe3(CO)12 and Fe(CO)5 with functionalized alkynes in CH3OH–KOH solution — The crystal structure of Fe2(CO)6(PPh3)[µ-η3-(H2CCCH2)]

2006 ◽  
Vol 84 (2) ◽  
pp. 337-344 ◽  
Author(s):  
Giuliana Gervasio ◽  
Domenica Marabello ◽  
Enrico Sappa ◽  
Andrea Secco
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Coordination Mode ◽  
Iron Complexes ◽  
Reaction Pathways ◽  
X Ray ◽  
Iron Carbonyls ◽  
By Products

The complex Fe2(CO)7(H2CCCH2) (1) is obtained starting from a variety of functionalized alkynes that can release C3 fragments during the reactions with Fe3(CO)12 or Fe(CO)5 in CH3OH–KOH solutions. Owing to the oily nature of 1, it was reacted with triphenylphosphine, and the structure of the resulting title compound (1a) has been determined by X-ray analysis. Complex 1a shows a new coordination mode of a H2C=C=CH2 ligand to a diiron centre and is, to our knowledge, unprecedented. We have also found that 1 (and 1a) are by-products, and not intermediates in the formation of complex 3. A discussion of the possible reaction pathways is given.Key words: iron carbonyls, alkynols, CO and methanol activation, acetyl and acetate complexes, allenyl iron complexes, crystal structure.

The X-ray structure ofSalmonella typhimuriumuridine nucleoside phosphorylase complexed with 2,2′-anhydrouridine, phosphate and potassium ions at 1.86 Å resolution

2009 ◽  
Vol 66 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Alexander A. Lashkov ◽  
Nadezhda E. Zhukhlistova ◽  
Azat H. Gabdoulkhakov ◽  
Alexander A. Shtil ◽  
Roman G. Efremov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Salmonella Typhimurium ◽  
Drug Target ◽  
Computational Approach ◽  
Potassium Ions ◽  
Uridine Phosphorylase ◽  
Nucleoside Phosphorylase ◽  
X Ray ◽  
Antitumour Agents ◽  
Important Drug

Uridine nucleoside phosphorylase is an important drug target for the development of anti-infective and antitumour agents. The X-ray crystal structure ofSalmonella typhimuriumuridine nucleoside phosphorylase (StUPh) complexed with its inhibitor 2,2′-anhydrouridine, phosphate and potassium ions has been solved and refined at 1.86 Å resolution (Rcryst= 17.6%,Rfree= 20.6%). The complex of human uridine phosphorylase I (HUPhI) with 2,2′-anhydrouridine was modelled using a computational approach. The model allowed the identification of atomic groups in 2,2′-anhydrouridine that might improve the interaction of future inhibitors withStUPh andHUPhI.

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