Two-Dimensional Hierarchical Supramolecular Assembly of a Silole Derivative and Surface-Assisted Chemical Transformations

2015 ◽  
Vol 119 (7) ◽  
pp. 3857-3863 ◽  
Author(s):  
Lei Dong ◽  
Weihua Wang ◽  
Tao Lin ◽  
Katharina Diller ◽  
Johannes V. Barth ◽  
...  
Keyword(s):  
Supramolecular Assembly ◽  
Chemical Transformations ◽  
Two Dimensional

Novel Flexible Supramolecular Assembly of Dioleyldimethylammonium Ion in a Two-Dimensional Nanospace Studied by Neutron Scattering

Langmuir ◽  
2019 ◽  
Vol 35 (43) ◽  
pp. 13977-13982 ◽  
Author(s):  
Kamonnart Jaa Imwiset ◽  
Takayuki Hayakawa ◽  
Yoshiaki Fukushima ◽  
Takeshi Yamada ◽  
Makoto Ogawa
Keyword(s):  
Neutron Scattering ◽  
Supramolecular Assembly ◽  
Two Dimensional

Two-Dimensional Infrared Spectroscopy and Principal Component Analysis Studies on a New Azobenzene Derivative Supramolecular System Based on Hydrogen Bonds

2003 ◽  
Vol 57 (8) ◽  
pp. 933-942 ◽  
Author(s):  
Yuqing Wu ◽  
Ya-Qiong Hao ◽  
Min Li ◽  
Chaowei Guo ◽  
Yukihiro Ozaki
Keyword(s):  
Principal Component Analysis ◽  
Hydrogen Bonds ◽  
Supramolecular Assembly ◽  
Principal Component ◽  
Correlation Spectroscopy ◽  
Supramolecular System ◽  
Two Dimensional ◽  
Temperature Dependent ◽  
2D Correlation Spectroscopy ◽  
2D Correlation Analysis

Infrared (IR) spectra of a supramolecular assembly with an azobenzene derivative and intermolecular hydrogen bonds have been measured in the temperature range from 30 to 200 °C to investigate heat-induced structural changes and thermal stability. Principal component analysis (PCA) and two kinds of two-dimensional (2D) correlation spectroscopy, variable–variable (VV) 2D and sample–sample (SS) 2D spectroscopy, have been employed to analyze the observed temperature-dependent spectral variations. The PCA and SS 2D correlation analyses have demonstrated that the complete decoupling of hydrogen bonds in the supramolecular assembly occurs between 110 and 115 °C, which is in good agreement with the results of a differential scanning calorimetry (DSC) study for the heating process. The PCA of the IR spectra in the region of 3600–3100 cm−1 has illustrated that there are at least four principal components for the different NH2 and CONH species in the present supramolecular system. The VV 2D correlation spectroscopy study has provided information about the structure and strength of hydrogen bonds of NH2 and CONH groups and their temperature-dependent variations. The different species of hydrogen-bonded NH2 and CONH groups in the supramolecular system can be clarified by the VV 2D correlation analysis. The VV 2D correlation analysis has also revealed the specific order of the temperature-induced changes in the hydrogen bonds of NH2 and CONH groups.

MÖSSBAUER STUDY OF STRUCTURAL–CHEMICAL TRANSFORMATION IN TWO-DIMENSIONAL IRON–OXYGEN NANOSTRUCTURES IN THE COURSE OF TRANSPORT REDUCTION

2000 ◽  
Vol 07 (01n02) ◽  
pp. 1-6
Author(s):  
V. M. SMIRNOV ◽  
G. P. VORONKOV ◽  
V. G. SEMENOV ◽  
V. G. POVAROV ◽  
I. V. MURIN
Keyword(s):  
Silica Surface ◽  
Covalent Bonding ◽  
Iron Silicate ◽  
Chemical Transformations ◽  
Two Dimensional ◽  
Mössbauer Study ◽  
Nanoscale Structures ◽  
Reduction Of Iron ◽  
Oxygen Groups ◽  
Surface Monolayers

Structural–chemical transformations of quasi-two-dimensional iron–oxygen nanostructures occurring at transport reduction were studied using NGR spectroscopy. It has been found that isolated iron–oxygen groups [i.e. groups containing iron and oxygen atoms: ≡Si–O–Fe(OH)2 and (≡Si–O–)2–FeOH] forming surface monolayers were not reduced at T = 400–600° C because of their covalent bonding with the silica surface. Reduction of iron oxide microparticles (microstructures) at T ≥ 600°C C resulted in the formation of metal iron in the form of α-Fe. It has been revealed that in the course of transport reduction (TR) of the samples with deposited monolayers (one or four monolayers) at T ≥ 600° C bulk phases of iron silicate and metal iron were formed. It has also been shown that the features of structural–chemical transformations of supported iron–oxygen nanolayers were in relation with the specific character of phase formation within nanoscale structures.

Programming Supramolecular Assembly and Chirality in Two-Dimensional Dicarboxylate Networks on a Cu(100) Surface

Nano Letters ◽  
2005 ◽  
Vol 5 (5) ◽  
pp. 901-904 ◽  
Author(s):  
Sebastian Stepanow ◽  
Nian Lin ◽  
Franck Vidal ◽  
Aitor Landa ◽  
Mario Ruben ◽  
...  
Keyword(s):  
Supramolecular Assembly ◽  
Two Dimensional

Molecularly Resolved Dynamics for Two-Dimensional Nucleation of Supramolecular Assembly

Nano Letters ◽  
2002 ◽  
Vol 2 (6) ◽  
pp. 601-604 ◽  
Author(s):  
H. Yanagi ◽  
H. Mukai ◽  
K. Ikuta ◽  
T. Shibutani ◽  
T. Kamikado ◽  
...  
Keyword(s):  
Supramolecular Assembly ◽  
Two Dimensional

Spring Transition Period in Lake Ontario — A Numerical Study of the Causes of the Large Biological and Chemical Gradients

1980 ◽  
Vol 37 (5) ◽  
pp. 823-833 ◽  
Author(s):  
Donald Scavia ◽  
John R. Bennett
Keyword(s):  
Transition Period ◽  
Numerical Study ◽  
Vertical Mixing ◽  
Lake Ontario ◽  
Chemical Transformations ◽  
Two Dimensional ◽  
Offshore Structure ◽  
Chemical Gradients ◽  
Dimensional Models

A two-dimensional model that calculates physical transport, as well as in situ biological and chemical transformations, accurately simulates observations made along a north–south transect in Lake Ontario during April–June 1972. Simulation results show that, during the transition period between spring and summer, the inshore–offshore structure of biological and chemical distributions is controlled by the interaction of in situ processes and differences in vertical mixing on either side of the 4° isotherm. Owing to reversals in flow patterns, the effect of advection is to reduce concentration gradients, but the effect on overall distributions is minimal. An analysis of sinking losses in one- and two-dimensional models indicates that the artificially low sinking rates used in one-dimensional models of the Great Lakes result from the neglect of upwelling.Key words: Lake Ontario; model, hydrodynamic, ecological; sinking, upwelling, convection cells, chemical distributions

Previously unreported p-terphenyl derivatives with antibiotic properties from the fruiting bodies of Sarcodonleucopus (Basidiomycetes). A two-dimensional nuclear magnetic resonance study

1987 ◽  
Vol 65 (10) ◽  
pp. 2369-2372 ◽  
Author(s):  
C. Tringali ◽  
M. Piattelli ◽  
C. Geraci ◽  
G. Nicolosi ◽  
C. Rocco
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Spectral Analysis ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Study ◽  
Chemical Transformations ◽  
Two Dimensional ◽  
Fruiting Bodies ◽  
Magnetic Resonance Study ◽  
Nuclear Magnetic

Two previously unreported antibiotic metabolites, 2′,3′,4″-triacetoxy-3,4,5′,6′-tetrahydroxy-p-terphenyl (10) and 2′,3′-diacetoxy-3,4,5′,6′,4″-pentahydroxy-p-terphenyl (11), have been isolated from the basidiomycete Sarcodonleucopus. Their structures have been determined by chemical transformations and spectral analysis, including heteronuclear two-dimensional nuclear magnetic resonance methods.

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