Ultrasmall Pd/Au bimetallic nanocrystals embedded in hydrogen-bonded supramolecular structures: facile synthesis and catalytic activities in the reduction of 4-nitrophenol

2015 ◽  
Vol 3 (38) ◽  
pp. 19433-19438 ◽  
Author(s):  
Feng Jiang ◽  
Ruimin Li ◽  
Jianhua Cai ◽  
Wei Xu ◽  
Anmin Cao ◽  
...  
Keyword(s):  
Supramolecular Structure ◽  
Bimetallic Nanoparticles ◽  
Catalytic Properties ◽  
Supramolecular Structures ◽  
Facile Synthesis ◽  
Catalytic Activities ◽  
Bimetallic Nanocrystals ◽  
Hydrogen Bonded

A hydrogen-bonded supramolecular structure supported with ultrasmall Au, Pd bimetallic nanoparticles was readily synthesized and showed unusual catalytic properties.

scholarly journals Catalytic Diversity of GH30 Xylanases

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4528
Author(s):  
Katarína Šuchová ◽  
Vladimír Puchart ◽  
Nikolaj Spodsberg ◽  
Kristian B. R. Mørkeberg Krogh ◽  
Peter Biely
Keyword(s):  
Methyl Ester ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Current Knowledge ◽  
Carboxyl Group ◽  
Weak Effect ◽  
Bacterial Enzymes ◽  
Catalytic Activities ◽  
Almost All ◽  
Free Carboxyl

Catalytic properties of GH30 xylanases belonging to subfamilies 7 and 8 were compared on glucuronoxylan, modified glucuronoxylans, arabinoxylan, rhodymenan, and xylotetraose. Most of the tested bacterial GH30-8 enzymes are specific glucuronoxylanases (EC 3.2.1.136) requiring for action the presence of free carboxyl group of MeGlcA side residues. These enzymes were not active on arabinoxylan, rhodymenan and xylotetraose, and conversion of MeGlcA to its methyl ester or its reduction to MeGlc led to a remarkable drop in their specific activity. However, some GH30-8 members are nonspecific xylanases effectively hydrolyzing all tested substrates. In terms of catalytic activities, the GH30-7 subfamily is much more diverse. In addition to specific glucuronoxylanases, the GH30-7 subfamily contains nonspecific endoxylanases and predominantly exo-acting enzymes. The activity of GH30-7 specific glucuronoxylanases also depend on the presence of the MeGlcA carboxyl, but not so strictly as in bacterial enzymes. The modification of the carboxyl group of glucuronoxylan had only weak effect on the action of predominantly exo-acting enzymes, as well as nonspecific xylanases. Rhodymenan and xylotetraose were the best substrates for exo-acting enzymes, while arabinoxylan represented hardly degradable substrate for almost all tested GH30-7 enzymes. The results expand current knowledge on the catalytic properties of this relatively novel group of xylanases.

Enforced 2D supramolecular structures within hydrogen-bonded molecular cocrystals

2009 ◽  
Vol 62 (12) ◽  
pp. 1964-1971 ◽  
Author(s):  
Shengli Huang ◽  
Hongwei Hou ◽  
Liwei Mi ◽  
Yaoting Fan
Keyword(s):  
Supramolecular Structures ◽  
Hydrogen Bonded

Facile synthesis of triple Ni-Mo-W alloys and their catalytic properties in chemical vapor deposition of chlorinated hydrocarbons

2021 ◽  
Vol 866 ◽  
pp. 158778
Author(s):  
Yury V. Shubin ◽  
Yury I. Bauman ◽  
Pavel E. Plyusnin ◽  
Ilya V. Mishakov ◽  
Maria S. Tarasenko ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Catalytic Properties ◽  
Chlorinated Hydrocarbons ◽  
Chemical Vapor ◽  
Facile Synthesis

Facile Synthesis and Catalytic Properties of β-Co(OH)2 and Mg (OH)2 Nanoplates

2007 ◽  
Vol 23 (5) ◽  
pp. 508-510
Author(s):  
L SUN ◽  
K WANG ◽  
S LUO ◽  
Q GUO ◽  
C HU
Keyword(s):  
Catalytic Properties ◽  
Facile Synthesis

Pyrazine dicarboxylate-bridged arsenotungstate: synthesis, characterization, and catalytic activities in epoxidation of olefins and oxidation of alcohols

2019 ◽  
Vol 48 (34) ◽  
pp. 12956-12963 ◽  
Author(s):  
Xinyi Ma ◽  
Peipei He ◽  
Baijie Xu ◽  
Jingkun Lu ◽  
Rong Wan ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Catalytic Activities ◽  
Oxidation Of Alcohols ◽  
Epoxidation Of Olefins

The catalytic properties and polyanionic structure of pyrazine dicarboxylate-bridged arsenotungstate are reported.

Stacked supramolecular structures involving hydrogen-bonded networks in highly functionalised tetrathiafulvalene derivatives

1995 ◽  
pp. 1201 ◽  
Author(s):  
Andrei S. Batsanov ◽  
Niels Svenstrup ◽  
Jesper Lau ◽  
Jan Becher ◽  
Martin R. Bryce ◽  
...  
Keyword(s):  
Supramolecular Structures ◽  
Hydrogen Bonded

Hydrogen bonded supramolecular structures of cationic and anionic module assemblies containing square-planar oximate complex anions

2004 ◽  
Vol 357 (12) ◽  
pp. 3746-3752 ◽  
Author(s):  
Igor O. Fritsky ◽  
Jolanta Świątek-Kozłowska ◽  
Agnieszka Dobosz ◽  
Tatiana Yu. Sliva ◽  
Nikolay M. Dudarenko
Keyword(s):  
Supramolecular Structures ◽  
Square Planar ◽  
Complex Anions ◽  
Hydrogen Bonded

Supramolecular structures of N 4-substituted 2,4-diamino-6-benzyloxy-5-nitrosopyrimidines

2003 ◽  
Vol 59 (2) ◽  
pp. 263-276 ◽  
Author(s):  
Manuel Melguizo ◽  
Antonio Quesada ◽  
John N. Low ◽  
Christopher Glidewell
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Intermolecular Interactions ◽  
Electronic Structures ◽  
Supramolecular Structure ◽  
Supramolecular Structures ◽  
Stacking Interactions ◽  
Molecular Electronic ◽  
Π Stacking

The molecular and supramolecular structures of eight N 4-substituted 2,4-diamino-6-benzyloxy-5-nitrosopyrimidines are discussed, along with one analogue containing no nitroso substituent. The nitroso derivatives all exhibit polarized molecular-electronic structures leading to extensive charge-assisted hydrogen bonding between the molecules. The intermolecular interactions include hard hydrogen bonds of N—H...O and N—H...N types, together with O—H...O and O—H...N types in the monohydrate of 2-amino-6-benzyloxy-4-piperidino-5-nitrosopyrimidine, soft hydrogen bonds of C—H...O, C—H...π(arene) and N—H...π(arene) types and aromatic π...π stacking interactions. The predominant supramolecular structure types take the form of chains and sheets, but no two of the structures determined here exhibit the same combination of hydrogen-bond types.

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