Self-Assembly of Hydroxy(phenyl)iodonium Ions in Acidic Aqueous Solution: Preparation, and X-ray Crystal Structures of Oligomeric Phenyliodine(III) Sulfates

2009 ◽  
Vol 48 (11) ◽  
pp. 4908-4917 ◽  
Author(s):  
Victor N. Nemykin ◽  
Alexey Y. Koposov ◽  
Brian C. Netzel ◽  
Mekhman S. Yusubov ◽  
Viktor V. Zhdankin
Keyword(s):  
Aqueous Solution ◽  
Crystal Structures ◽  
Self Assembly ◽  
Acidic Aqueous Solution ◽  
X Ray ◽  
Solution Preparation

Crystal structures of (S)- and (R,S)-2,2′-bipyridine-3,3′-dicarboxylic acid 1,1′-dioxides and of their barium salts: absolute configuration and molecular distortion enforced by supramolecular self-assembly

1997 ◽  
Vol 212 (3) ◽  
Author(s):  
P. Vojtíšek ◽  
I. Císařová ◽  
J. Podlaha ◽  
Z. Žák ◽  
S. Böhm ◽  
...  
Keyword(s):  
Single Crystal ◽  
Dicarboxylic Acid ◽  
Crystal Structures ◽  
Absolute Configuration ◽  
Self Assembly ◽  
Barium Salt ◽  
X Ray Diffraction ◽  
X Ray

AbstractCrystal structures of the title compounds were determined by single crystal X-ray diffraction. Absolute configuration of the barium salt of (+)-(

Synthesen, Kristallstrukturen und Eigenschaften von Trisilber-und Trikalium-tri-μ-imido-cyclotriphosphat, Ag3(PO2NH)3 und K3(PO2NH)3 / Syntheses, Crystal Structures, and Properties of Trisilver and Tripotassium Tri-μ-im ido Cyclotriphosphate, Ag3(PO2NH)3 and K3(PO2NH)3

1997 ◽  
Vol 52 (2) ◽  
pp. 251-255 ◽  
Author(s):  
N. Stock ◽  
W. Schnick
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Nitrogen Atom ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Chair Conformation ◽  
X Ray ◽  
Diffusion Controlled ◽  
Structures And Properties ◽  
Ray Methods

Abstract Coarse crystalline Ag3(PO2NH)3 (1) and K3(PO2NH)3 (2) are obtained by addition of an aqueous solution of AgNO3 to an acidified solution of Na3(PO2NH)3 · 4H2O and by diffusion controlled addition of ethanol to a solution of K3(PO2NH)3 in water, respectively. The crystal structures of 1 and 2 have been determined by single crystal X-ray methods (Ag3(PO2NH)3: P21/c; a = 1166.6(1), b = 786.4(1), c = 997.8(1) pm, β = 106.91(1)°; Z = 4. K3(PO2NH)3: R3̄; a = 1271.4(2), c = 1017.9(2) pm, Z = 6). In Ag3(PO2NH)3 the cyclic anion is markedly distorted because of interactions between Ag+ and one nitrogen atom of the anion. In K3(PO2NH)3 the trimetaphosphimate ring shows a chair conformation and two cyclic anions are connected to each other by hydrogen bonds. DTA/TG investigations show thermal decomposition above 275 and 250 °C for 1 and 2, respectively.

scholarly journals Effects of Hydrophobic Modifications on the Solution Self-Assembly of P(DMAEMA-co-QDMAEMA)-b-POEGMA Random Diblock Copolymers

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 338
Author(s):  
Martha Kafetzi ◽  
Stergios Pispas
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Temperature Response ◽  
High Mass ◽  
Alkyl Chains ◽  
Release Studies ◽  
Solution Preparation ◽  
Assembly Behavior

In this work, the synthesis and the aqueous solution self-assembly behavior of novel partially hydrophobically modified poly(2-(dimethylamino) ethyl methacrylate)-b-poly(oligo(ethylelene glycol) methyl ether methacrylatetabel) pH and temperature responsive random diblock copolymers (P(DMAEMA-co-Q6/12DMAEMA)-b-POEGMA), are reported. The chemical modifications were accomplished via quaternization with 1-iodohexane (Q6) and 1-iodododecane (Q12) and confirmed by 1H-NMR spectroscopy. The successful synthesis of PDMAEMA-b-POEGMA precursor block copolymers was conducted by RAFT polymerization. The partial chemical modification of the diblocks resulted in the permanent attachment of long alkyl chains on the amine groups of the PDMAEMA block and the presence of tertiary and quaternary amines randomly distributed within the PDMAEMA block. Light scattering techniques confirmed that the increased hydrophobic character results in the formation of nanoaggregates of high mass and tunable pH and temperature response. The characteristics of the aggregates are also affected by the aqueous solution preparation protocol, the nature of the quaternizing agent and the quaternization degree. The incorporation of long alkyl chains allowed the encapsulation of indomethacin within the amphiphilic diblock copolymer aggregates. Nanostructures of increased size were detected due to the encapsulation of indomethacin into the interior of the hydrophobic domains. Drug release studies demonstrated that almost 50% of the encapsulated drug can be released on demand by aid of ultrasonication.

Photooxidation Activity of Mixed Phase TiO2 Nanoparticles

2014 ◽  
Vol 998-999 ◽  
pp. 79-82
Author(s):  
Jing Wei ◽  
Liang Guo Yan ◽  
Hang Li ◽  
Yi Yi Zhao
Keyword(s):  
Aqueous Solution ◽  
Crystal Structures ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixing Ratios ◽  
Calcination Temperatures ◽  
Sol Gel Process

The different mixing ratios of TiO2 nanoparticles were synthesized using sol–gel process by changing the temperature of calcinations. The crystal structures were characterized by X-ray diffraction (XRD). The photocatalytic action of TiO2 nanoparticles was investigated through the photooxidation of Rhodamine B in aqueous solution. The XRD results indicated that the rutile ratios of different calcination temperatures (500°C, 600°C, 700°C and 800°C, respectively) TiO2 nanoparticles were 0%, 20.87%, 92.41% and 100%, respectively. The TiO2 nanoparticles which calcinated at 600 °C had the highest photocatalytic action; under UV irradiation of 4 h, initial Rhodamine B concentration of 15 mg/L, TiO2 nanoparticles (calcinated at 600 °C) dosage of 1g/L, the degradation rate of Rhodamine B could achieve to 97.87%. The addition of rutile to anatase could particularly improve the photooxidation activity of TiO2 nanoparticles.

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