The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Yu V Mironov - One of the best experts on this subject based on the ideXlab platform.
-
Structure of Ionic Cluster complex [{Er(H_2O)_2(phen)_2(μ-OH)}_2][Re_4Te_4(CN)_12]•13H_2O
Russian Chemical Bulletin, 2016Co-Authors: Yu M Litvinova, Ya M Gayfulin, D. G. Samsonenko, Yu V MironovAbstract:The rhenium Cluster complex [{Er(H_2O)_2(phen)_2(μ-OH)}_2][Re_4Te_4(CN)_12]•13H_2O ( 1 ) was synthesized and structurally characterized. The structure of the salt was determined by single-crystal X-ray diffraction analysis. Compound 1 contains a new dimeric catIonic fragment [{Er(H_2O)_2(phen)_2(μ-OH)}] _2 ^4+ .
-
structure of Ionic Cluster complex er h 2 o 2 phen 2 μ oh 2 re 4 te 4 cn 12 13h 2 o
Russian Chemical Bulletin, 2016Co-Authors: Yu M Litvinova, Ya M Gayfulin, Yu V Mironov, D. G. SamsonenkoAbstract:The rhenium Cluster complex [{Er(H2O)2(phen)2(μ-OH)}2][Re4Te4(CN)12]•13H2O (1) was synthesized and structurally characterized. The structure of the salt was determined by single-crystal X-ray diffraction analysis. Compound 1 contains a new dimeric catIonic fragment [{Er(H2O)2(phen)2(μ-OH)}] 2 4+ .
-
structure of Ionic Cluster complex phenh 4 re4te4 cn 12 4h2o
Journal of Structural Chemistry, 2015Co-Authors: Yu M Litvinova, N V Kuratieva, Ya M Gayfulin, Yu V MironovAbstract:A tetrahedral Cluster complex of rhenium with the composition (PhenH)4[Re4Te4(CN)12]·4H2O (1) is obtained and structurally characterized. The structure of the salt is determined by single crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Fdd2, a = 23.1780(7) A, b = 50.009(2) A, c = 11.4274(3) A, V = 13245.6(7) A3.
-
synthesis crystal structure and thermal stability of Ionic Cluster compounds phenh 4 re4q4 cn 12 nh2o q s se n 6 q te n 10
Journal of Coordination Chemistry, 2015Co-Authors: Ya M Gayfulin, A I Smolentsev, Yu V MironovAbstract:Three new salts of tetrahedral rhenium chalcocyanide Cluster anions [Re4Q4(CN)12]4− (Q = S, Se, Te) and 1,10-phenanthroline-1-ium cations, (phenH)4[Re4S4(CN)12]·6H2O (1), (phenH)4[Re4Se4(CN)12]·6H2O (2), and (phenH)4[Re4Te4(CN)12]·10H2O (3), have been synthesized by reactions of K4[Re4Q4(CN)12]·nH2O with 1,10-phenanthroline in the presence of Nd3+ in an acidic aqueous medium (pH 4). 1 and 2 exhibit similar 2-D layered supramolecular architectures based on hydrogen bonds between water molecules, CN-groups of Cluster anions, and phenH+ cations. The latter are involved in π–π and C–H⋯π stacking interactions, connecting the adjacent layers with each other. Complex 3 demonstrates a 3-D framework based on hydrogen bonds between water molecules and CN-groups, π–π and C–H⋯π interactions. Notably short O···Te contacts of 3.40 and 3.50 A are found in the structure of 3. The thermal properties of 1–3 have been investigated by TG-DTG.
-
crystal structure of the Ionic Cluster complex 2 2 bipyh2 2 re4se4 cn 12 2 2 bipy 7h2o
Journal of Structural Chemistry, 2014Co-Authors: Ya M Gaifulin, Yu V Mironov, A I SmolentsevAbstract:A rhenium Cluster complex (2,2′-bipyH2)2[Re4Se4(CN)12] · (2,2′-bipy)·7H2O (1) is obtained and characterized. The compound crystallizes in a monoclinic space group C2/c with the unit cell parameters: a = 16.9191(6) A, b = 18.7458(6) A, c = 19.0139(5) A, β = 108.568(1)°, V = 5716.6(3) A3, Z = 4, d x = 2.291 g/cm3. The crystal structure is a packing of bipyridylium cations (2,2′-bipyH2)2+, Cluster anions [Re4Se4(CN)12]4−, bipyridyl molecules, and crystal water molecules, which are linked together by a system of hydrogen bonds.
Seungyeop Kwak - One of the best experts on this subject based on the ideXlab platform.
-
Ionic Cluster size distributions of swollen nafion sulfated β cyclodextrin membranes characterized by nuclear magnetic resonance cryoporometry
Journal of Physical Chemistry B, 2007Co-Authors: Jaedeok Jeon, Seungyeop KwakAbstract:Nafion/sb-CD membranes were prepared by mixing 5 wt% Nafion solution with H+-form sulfated β-cyclodextrin (sb-CD), and their water uptakes, ion exchange capacities (IECs), and Ionic Cluster size distributions were measured. Gravimetric and thermogravimetric measurements showed that the water uptake of the membranes increased with increases in their sb-CD content. The IECs of the membrane were measured with acid−base titration and found to increase with increases in the sb-CD content, reaching 0.96 mequiv/g for NC5 (“NCx” denotes a Nafion/sb-CD composite membrane containing x wt% of sb-CD). The Cluster-correlation peaks and Ionic Cluster size distributions of the water-swollen membranes were determined using small-angle X-ray scattering (SAXS) and 1H nuclear magnetic resonance (NMR) cryoporometry, respectively. The SAXS experiments confirmed that increases in the sb-CD content of the membranes shifted the maximum SAXS peaks to lower angles, indicating an increase in the Cluster correlation peak. NMR cryopo...
-
Ionic Cluster size distributions of swollen nafion/sulfated β-cyclodextrin membranes characterized by nuclear magnetic resonance cryoporometry
Journal of Physical Chemistry B, 2007Co-Authors: Jaedeok Jeon, Seungyeop KwakAbstract:Nafion/sb-CD membranes were prepared by mixing 5 wt% Nafion solution with H+-form sulfated β-cyclodextrin (sb-CD), and their water uptakes, ion exchange capacities (IECs), and Ionic Cluster size distributions were measured. Gravimetric and thermogravimetric measurements showed that the water uptake of the membranes increased with increases in their sb-CD content. The IECs of the membrane were measured with acid−base titration and found to increase with increases in the sb-CD content, reaching 0.96 mequiv/g for NC5 (“NCx” denotes a Nafion/sb-CD composite membrane containing x wt% of sb-CD). The Cluster-correlation peaks and Ionic Cluster size distributions of the water-swollen membranes were determined using small-angle X-ray scattering (SAXS) and 1H nuclear magnetic resonance (NMR) cryoporometry, respectively. The SAXS experiments confirmed that increases in the sb-CD content of the membranes shifted the maximum SAXS peaks to lower angles, indicating an increase in the Cluster correlation peak. NMR cryopo...
Ya M Gayfulin - One of the best experts on this subject based on the ideXlab platform.
-
structure of Ionic Cluster complex er h 2 o 2 phen 2 μ oh 2 re 4 te 4 cn 12 13h 2 o
Russian Chemical Bulletin, 2016Co-Authors: Yu M Litvinova, Ya M Gayfulin, Yu V Mironov, D. G. SamsonenkoAbstract:The rhenium Cluster complex [{Er(H2O)2(phen)2(μ-OH)}2][Re4Te4(CN)12]•13H2O (1) was synthesized and structurally characterized. The structure of the salt was determined by single-crystal X-ray diffraction analysis. Compound 1 contains a new dimeric catIonic fragment [{Er(H2O)2(phen)2(μ-OH)}] 2 4+ .
-
Structure of Ionic Cluster complex [{Er(H_2O)_2(phen)_2(μ-OH)}_2][Re_4Te_4(CN)_12]•13H_2O
Russian Chemical Bulletin, 2016Co-Authors: Yu M Litvinova, Ya M Gayfulin, D. G. Samsonenko, Yu V MironovAbstract:The rhenium Cluster complex [{Er(H_2O)_2(phen)_2(μ-OH)}_2][Re_4Te_4(CN)_12]•13H_2O ( 1 ) was synthesized and structurally characterized. The structure of the salt was determined by single-crystal X-ray diffraction analysis. Compound 1 contains a new dimeric catIonic fragment [{Er(H_2O)_2(phen)_2(μ-OH)}] _2 ^4+ .
-
structure of Ionic Cluster complex phenh 4 re4te4 cn 12 4h2o
Journal of Structural Chemistry, 2015Co-Authors: Yu M Litvinova, N V Kuratieva, Ya M Gayfulin, Yu V MironovAbstract:A tetrahedral Cluster complex of rhenium with the composition (PhenH)4[Re4Te4(CN)12]·4H2O (1) is obtained and structurally characterized. The structure of the salt is determined by single crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Fdd2, a = 23.1780(7) A, b = 50.009(2) A, c = 11.4274(3) A, V = 13245.6(7) A3.
-
synthesis crystal structure and thermal stability of Ionic Cluster compounds phenh 4 re4q4 cn 12 nh2o q s se n 6 q te n 10
Journal of Coordination Chemistry, 2015Co-Authors: Ya M Gayfulin, A I Smolentsev, Yu V MironovAbstract:Three new salts of tetrahedral rhenium chalcocyanide Cluster anions [Re4Q4(CN)12]4− (Q = S, Se, Te) and 1,10-phenanthroline-1-ium cations, (phenH)4[Re4S4(CN)12]·6H2O (1), (phenH)4[Re4Se4(CN)12]·6H2O (2), and (phenH)4[Re4Te4(CN)12]·10H2O (3), have been synthesized by reactions of K4[Re4Q4(CN)12]·nH2O with 1,10-phenanthroline in the presence of Nd3+ in an acidic aqueous medium (pH 4). 1 and 2 exhibit similar 2-D layered supramolecular architectures based on hydrogen bonds between water molecules, CN-groups of Cluster anions, and phenH+ cations. The latter are involved in π–π and C–H⋯π stacking interactions, connecting the adjacent layers with each other. Complex 3 demonstrates a 3-D framework based on hydrogen bonds between water molecules and CN-groups, π–π and C–H⋯π interactions. Notably short O···Te contacts of 3.40 and 3.50 A are found in the structure of 3. The thermal properties of 1–3 have been investigated by TG-DTG.
Lorna Dougan - One of the best experts on this subject based on the ideXlab platform.
-
tuning protein mechanics through an Ionic Cluster graft from an extremophilic protein
Soft Matter, 2016Co-Authors: Katarzyna M Tych, Matthew Batchelor, Toni Hoffmann, Michael C Wilson, Emanuele Paci, David J Brockwell, Lorna DouganAbstract:Proteins from extremophilic organisms provide excellent model systems to determine the role of non-covalent interactions in defining protein stability and dynamics as well as being attractive targets for the development of robust biomaterials. Hyperthermophilic proteins have a prevalence of salt bridges, relative to their mesophilic homologues, which are thought to be important for enhanced thermal stability. However, the impact of salt bridges on the mechanical properties of proteins is far from understood. Here, a combination of protein engineering, biophysical characterisation, single molecule force spectroscopy (SMFS) and molecular dynamics (MD) simulations directly investigates the role of salt bridges in the mechanical stability of two cold shock proteins; BsCSP from the mesophilic organism Bacillus subtilis and TmCSP from the hyperthermophilic organism Thermotoga maritima. Single molecule force spectroscopy shows that at ambient temperatures TmCSP is mechanically stronger yet, counter-intuitively, its native state can withstand greater deformation before unfolding (i.e. it is mechanically soft) compared with BsCSP. MD simulations were used to identify the location and quantify the population of salt bridges, and reveal that TmCSP contains a larger number of highly occupied salt bridges than BsCSP. To test the hypothesis that salt-bridges endow these mechanical properties on the hyperthermophilic CSP, a charged triple mutant (CTM) variant of BsCSP was generated by grafting an Ionic Cluster from TmCSP into the BsCSP scaffold. As expected CTM is thermodynamically more stable and mechanically softer than BsCSP. We show that a grafted Ionic Cluster can increase the mechanical softness of a protein and speculate that it could provide a mechanical recovery mechanism and that it may be a design feature applicable to other proteins.
Jaedeok Jeon - One of the best experts on this subject based on the ideXlab platform.
-
Ionic Cluster size distributions of swollen nafion sulfated β cyclodextrin membranes characterized by nuclear magnetic resonance cryoporometry
Journal of Physical Chemistry B, 2007Co-Authors: Jaedeok Jeon, Seungyeop KwakAbstract:Nafion/sb-CD membranes were prepared by mixing 5 wt% Nafion solution with H+-form sulfated β-cyclodextrin (sb-CD), and their water uptakes, ion exchange capacities (IECs), and Ionic Cluster size distributions were measured. Gravimetric and thermogravimetric measurements showed that the water uptake of the membranes increased with increases in their sb-CD content. The IECs of the membrane were measured with acid−base titration and found to increase with increases in the sb-CD content, reaching 0.96 mequiv/g for NC5 (“NCx” denotes a Nafion/sb-CD composite membrane containing x wt% of sb-CD). The Cluster-correlation peaks and Ionic Cluster size distributions of the water-swollen membranes were determined using small-angle X-ray scattering (SAXS) and 1H nuclear magnetic resonance (NMR) cryoporometry, respectively. The SAXS experiments confirmed that increases in the sb-CD content of the membranes shifted the maximum SAXS peaks to lower angles, indicating an increase in the Cluster correlation peak. NMR cryopo...
-
Ionic Cluster size distributions of swollen nafion/sulfated β-cyclodextrin membranes characterized by nuclear magnetic resonance cryoporometry
Journal of Physical Chemistry B, 2007Co-Authors: Jaedeok Jeon, Seungyeop KwakAbstract:Nafion/sb-CD membranes were prepared by mixing 5 wt% Nafion solution with H+-form sulfated β-cyclodextrin (sb-CD), and their water uptakes, ion exchange capacities (IECs), and Ionic Cluster size distributions were measured. Gravimetric and thermogravimetric measurements showed that the water uptake of the membranes increased with increases in their sb-CD content. The IECs of the membrane were measured with acid−base titration and found to increase with increases in the sb-CD content, reaching 0.96 mequiv/g for NC5 (“NCx” denotes a Nafion/sb-CD composite membrane containing x wt% of sb-CD). The Cluster-correlation peaks and Ionic Cluster size distributions of the water-swollen membranes were determined using small-angle X-ray scattering (SAXS) and 1H nuclear magnetic resonance (NMR) cryoporometry, respectively. The SAXS experiments confirmed that increases in the sb-CD content of the membranes shifted the maximum SAXS peaks to lower angles, indicating an increase in the Cluster correlation peak. NMR cryopo...
