Unexpected Participation of the Carbonate Anion in the Assembly of Hexanuclear Cadmium(II) Trimethylacetate Complex

2020 ◽  
Vol 46 (8) ◽  
pp. 553-556
Author(s):  
G. N. Kuznetsova ◽  
D. S. Yambulatov ◽  
M. A. Kiskin ◽  
N. V. Gogoleva ◽  
M. A. Shmelev ◽  
...  
Keyword(s):  
Carbonate Anion

Engineering an iridium-containing metal–organic molecular capsule for induced-fit geometrical conversion and dual catalysis

2016 ◽  
Vol 52 (62) ◽  
pp. 9628-9631 ◽  
Author(s):  
Xuezhao Li ◽  
Jinguo Wu ◽  
Liyong Chen ◽  
Xiaoming Zhong ◽  
Cheng He ◽  
...  
Keyword(s):  
Cooperative Binding ◽  
Induced Fit ◽  
Molecular Capsule ◽  
Metal Organic ◽  
Dual Catalysis ◽  
Carbonate Anion

Quantitative dynamic capsule–capsule conversion by cooperative binding one carbonate anion and switchable dual catalysis was achieved within an Ir2Co3-type capsule.

Amphiphilic copolymer with pendant pyrenebutyryl hydrazide group: Synthesis, characterization, and recognition for carbonate anion

2006 ◽  
Vol 101 (4) ◽  
pp. 2371-2376 ◽  
Author(s):  
Zhaoqiang Wu ◽  
Lingzhi Meng ◽  
Cheng Li ◽  
Xiaoju Lu ◽  
Lifen Zhang ◽  
...  
Keyword(s):  
Amphiphilic Copolymer ◽  
Carbonate Anion

Sheath disassembly in Methanospirillum hungatei strain GP1

1986 ◽  
Vol 32 (11) ◽  
pp. 847-854 ◽  
Author(s):  
G. Dennis Sprott ◽  
Terry J. Beveridge ◽  
Girishchandra B. Patel ◽  
Giulio Ferrante
Keyword(s):  
Matrix Material ◽  
Sodium Dodecyl ◽  
Unit Cell ◽  
Large Decrease ◽  
Methanospirillum Hungatei ◽  
Alkaline Conditions ◽  
The Individual ◽  
Polypeptide Profile ◽  
Carbonate Anion ◽  
Crystalline Array

Sheaths of Methanospirillum hungatei are very resilient structures and consist of circumferential rings, which have been likened to the hoops of a barrel. The isolated sheaths are dramatically disassembled to the individual hoops upon treatment with β-mercaptoethanol at 90 °C. Sheath disassembly resulted in a large decrease in suspension turbidity and a release of approximately 10% of sheath protein in the form of 4.6 to 7.0 kiloDalton (kDa) peptides. These are referred to as "glue peptides" to suggest a function in linking the hoops together to form the intact sheath. The liberated hoops consisted of a protein surface array crystallized on a matrix material. Intact sheaths, or hoops largely freed of the glue peptides, could be solubilized at 90 °C by (i) a combination of β-mercaptoethanol and sodium dodecyl sulfate, (ii) by alkaline conditions of pH 12 or more, or partially (iii) by carbonate anion at pH 11. Fractionation by liquid chromatography of hoops solubilized by alkaline conditions of pH 12.6 revealed major polypeptides of about 24 and 45 kDa; a smaller peak occurred at 12 kDa. Based on the dimensions of the unit cell of the crystalline array, we suggest that two copies of the 24-kDa polypeptide form the 5.6 × 2.8 nm unit cell as a dimer, which then tends to form larger aggregates. The 2.8-nm subunit may be a dimer of the 12-kDa species. Sheaths of M. hungatei strain JF1 exhibited a similar polypeptide profile, but in this case, the 45-kDa species predominated.

scholarly journals Carbonate anion controlled growth of LiCoPO4/C nanorods and its improved electrochemical behavior

2013 ◽  
Vol 101 ◽  
pp. 18-26 ◽  
Author(s):  
Gangulibabu ◽  
Kalaiselvi Nallathamby ◽  
Danielle Meyrick ◽  
Manickam Minakshi
Keyword(s):  
Electrochemical Behavior ◽  
Controlled Growth ◽  
Carbonate Anion

scholarly journals Bis[bis(2,2′-bipyridine-κ2N,N′)(carbonato-κ2O,O′)cobalt(III)] 2-{4-[(carboxylatomethyl)carbamoyl]benzamido}acetate hexahydrate

2014 ◽  
Vol 70 (5) ◽  
pp. m160-m161 ◽  
Author(s):  
Niels-Patrick Pook ◽  
Mimoza Gjikaj ◽  
Arnold Adam
Keyword(s):  
Complex Cation ◽  
Three Dimensional ◽  
Water Molecules ◽  
Supramolecular Network ◽  
Asymmetric Unit ◽  
Aromatic Rings ◽  
Coordination Environment ◽  
Distorted Octahedral ◽  
Carbonate Anion ◽  
Distorted Octahedral Coordination Environment

The complex cation of the title compound, [Co(CO3)(C10H8N2)2]2(C12H10N2O6)·6H2O, contains a CoIIIatom with a distorted octahedral coordination environment formed by four N atoms from two bidentate 2,2′-bipyridine ligands and one bidentate carbonate anion. The asymmetric unit is completed by one-half of the 2-({4-[(carboxylatomethyl)carbamoyl]phenyl}formamido)acetate dianion, which is located on a centre of inversion, and by three water molecules. Two [Co(CO3)(C10H8N2)2]+cations are connected through C—H...O contacts by the uncoordinating anions. The aromatic rings of the 2,2′-bipyridine ligands and diacetate anions are involved in π–π stacking and C—H...π interactions. The centroid–centroid distances are in the range 3.4898 (4)–3.6384 (5) Å. The crystal structure is stabilized by further O—H...O and N—H...O hydrogen bonds, which give rise to a three-dimensional supramolecular network.

A bis-copper(II)–[D-βVal3,7]ascidiacyclamide complex enveloping two square pyramids and sharing an apex atom from a carbonate anion

2019 ◽  
Vol 75 (8) ◽  
pp. 1182-1187 ◽  
Author(s):  
Akiko Asano ◽  
Mitsinobu Doi
Keyword(s):  
Amino Acids ◽  
Water Molecule ◽  
Copper Complex ◽  
Structural Changes ◽  
Ring Expansion ◽  
Membered Ring ◽  
Water Molecules ◽  
Ring Size ◽  
Cd Spectra ◽  
Carbonate Anion

The four azole rings place structural restrictions on ascidiacyclamide (ASC). As a result, the structure of ASC exists in an equilibrium between two major forms (i.e. folded and square). [D-βVal3,7]Ascidiacyclamide (βASC) was synthesized by replacing two D-Val-Thz (Val is valine and Thz is thiazole) blocks with D-β-Valine (D-βVal-Thz). This modification expands the peptide ring; the original 24-membered macrocycle of ASC becomes a 26-membered ring. Circular dichroism (CD) spectra showed that, in solution, the structural equilibrium is maintained with βASC, but the folded form is dominant. A copper complex was prepared, namely [[D-βVal3,7]ascidiacyclamide(2−)]aqua-μ-carbonato-dicopper(II) monohydrate, [Cu2(C38H54N8O6S2)(CO3)(H2O)]·H2O, to determine the effect of the change in ring size on the coordinated structure. The obtained bis-CuII–βASC complex contains two water molecules and a carbonate anion. Two CuII ions are chelated by three N-donor atoms of two Thz–Ile–Oxz (Ile is isoleucine and Oxz is oxazoline) units. An O atom of the carbonate anion bridges two CuII ions, forming two square pyramids. These features are similar to the previously reported structure of the CuII–ASC complex, but the two pyramids are enveloped inside the peptide and share one apex. In the CuII–ASC complex, the apex of each square pyramid is an O atom of a water molecule, and the two pyramids are oriented toward the outside of the peptide. The incorporated β-amino acids of βASC make the space inside the peptide large enough to envelop the two square pyramids. The observed structural changes in the bis-CuII–βASC complex arising from ring expansion are particularly interesting in the context of the previously reported structure of the CuII–ASC complex.

Ein neues Carbonat mit Baylissit-Struktur: Rb2[Mg(CO3)2(H2O)4] / A New Carbonate with Baylissite Structure: Rb2[Mg(CO3)2(H2O)4]

1994 ◽  
Vol 49 (10) ◽  
pp. 1368-1372 ◽  
Author(s):  
Yue Qing Zheng ◽  
Arnold Adam
Keyword(s):  
Hydrogen Bonds ◽  
Coordination Number ◽  
Type Structure ◽  
Space Group ◽  
Cell Dimensions ◽  
Potassium Compound ◽  
Carbonate Anion

Abstract The new complex carbonate Rb2[Mg(CO3)2(H2O))4] crystallizes in the Baylissite-type structure with a = 1130,4(3), b = 641,9(1), c = 703,3(2) pm, β = 99,62(1)°, VEZ = 503,2(2), space group P21/n (No. 14) and Z = 2. In comparison with the isostructural potassium compound the cell dimensions increase in b- and c- and decrease in a-direction. This effect depends on the greater coordination number of Rb+ and the rigidity of strong hydrogen bonds. The carbonate anion exhibits significant deviations from D3h-symmetry (C -O: 127,1(5)-130,2(5) pm, ∠ O - C - O: 117,9(4)-121,1(3)°).

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