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Recent News and Articles on the Keywords: chemists find + chemical bonds + surprisingly  Related to the article below (Last Update: 5/12/2008)


SitNews
Chemical Eye on Holey Water
SitNews, AK - May 7, 2008
Chemists explain this curious behavior by invoking the phenomenon known as the hydrogen bond. Hydrogen bonds were famously used to explain both the ...
Source: Google News

[BOOK] The Chemical Bond in Inorganic Chemistry: The Bond Valence Model -
ID Brown - 2002 - books.google.com
... that people have not attempted to find a connection ... properties appearing in the
inorganic chemistry of solids. ... not cover all types of chemical bonding, it can ...

… orbital Hamilton populations (COHP): energy-resolved visualization of chemical bonding in solids … -
R Dronskowski, PE Bloechl - The Journal of Physical Chemistry, 1993 - pubs.acs.org
... Therefore, a local way of looking at chemical bonds in solids might seem to be
ill-fitting. However, since solid-state chemistry is a burgeoning field and solid ...

[BOOK] Solvents and Solvent Effects in Organic Chemistry
C Reichardt - 2003 - books.google.com
... the reviews cited, the reader will find easy access ... Since solvent effects on chemical
reactivity have been known for more than a century, most chemists are now ...

Electron transfer reactions in chemistry. Theory and experiment -
RA Marcus - Reviews of Modern Physics, 1993 - APS
... unknown Pu (r) and, hence, to find the G ... A. Marcus: Electron transfer reactions in
chemistry been explored by ... volved the rupture of a chemical bond by electron ...

Patterns in Hydrogen Bonding: Functionality and Graph Set Analysis in Crystals -
J Bernstein, RE Davis, L Shimoni, NL Chang - Angewandte Chemie International Edition in English, 1995 - doi.wiley.com
... and bewil- dered; yet JOU sought to find out a ... tion similar to that of organic chemists
for the ... Just as widely differing chemical groups may exhibit similar ...

[PDF] Density functional theory of electronic structure -
W Kohn, AD Becke, RG Parr - J. Phys. Chem, 1996 - hi.is
... well with experiment 11,12 in ?ordinary? chemical bonds (ie, H bonds and van ... 13 It
does not, unfortunately, offer improved chemistry, though evidence of ...
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Interlocking of molecular threads: from the statistical approach to the templated synthesis of …
CO Dietrich-Buchecker, JP Sauvage - Chemical Reviews, 1987 - pubs.acs.org
... We find this especially true for interlocked rings and ... In contrast to organic chemistry,
where only a few ... the atoms and the covalent chemical bonds between them ...

[BOOK] Salters Advanced Chemistry -
G Burton - 2000 - books.google.com
... study the Chemical Ideas you will find problems to ... Chemical amounts are defined so
that the mass of ... relative atomic masses for atoms, so chemists use relative ...

[PDF] Building the structural concepts of chemistry: Some considerations from educational research -
KS Taber - Chemistry Education: Research and Practice in Europe, 2001 - uoi.gr
... cases where the learner can not find any suitable ... BUILDING THE STRUCTURAL CONCEPTS
OF CHEMISTRY ... A chemical bond is ?the linkage between atoms in molecules ...

Hydrogen bonds as design elements in organic chemistry -
MC Etter - The Journal of Physical Chemistry, 1991 - pubs.acs.org
... of RDX-TNT composite (Figure 3c), we can find substantial intensity ... a new synthesis
is to a solution chemist, Le., the formation of new chemical species. ...

Source: Google Scholar

Surprisingly, Chemists Find, Some Solvents Can Alter Chemical Bonds

BUFFALO, N.Y. -- New University at Buffalo research demonstrates that some solvents can significantly enhance certain acid-base interactions and strengthen the bonding interaction between two molecules when one is electron-deficient and one is electron-rich.

The research, published recently in the Journal of Physical Chemistry A, suggests a potentially powerful new tool for initiating these interactions, which occur in many important inorganic cluster complexes, including biological enzymes.

"Any time a chemist can focus chemistry at a particular bond and find a new way to weaken chemical bonds in order to initiate chemical reactions, that gives you leverage," said James F. Garvey, Ph.D., UB professor of chemistry and a co-author on the paper.

According to the UB researchers, solvent molecules surrounding Lewis acid-base complexes can significantly affect the strength of chemical bonds within that complex.

Lewis acids are molecules that act as electron-pair acceptors, while a Lewis base molecule will act as an electron-pair donor; the base donates electron density to the acid to form an acid-base complex.

"What was surprising was our observation that solvation made that interaction stronger, inducing the base to donate more electron density to the acid, thereby strengthening the bonding interaction," said Garvey.

In the UB studies, the solvent reaction actually changed the nature of the carbon-nitrogen bond between the Lewis acid (a benzene radical cation) and the Lewis base (ammonia).

"We found that when the chemical bond is generated by the mechanism of electron transfer, microsolvation can play a tremendous role in effecting the nature of that bond," said Garvey.

The experimental results were generated through molecular-beam studies of gas-phase ions using a tandem quadrupole mass spectrometer and were supported by calculations performed at UB's Center for Computational Research in the New York State Center of Excellence in Bioinformatics and Life Sciences.

The research was a collaborative effort among organic, physical and theoretical chemists in the UB Department of Chemistry.

In addition to Garvey, co-authors were Marek Freindorf, Ph.D., computational chemist at CCR; Thomas Furlani, Ph.D., professor and CCR director; Robert L. DeLeon, Ph.D., adjunct associate professor; John P. Richard, Ph.D., professor, and Chi-Tung Chiang, graduate student, all of the Department of Chemistry in the UB College of Arts and Sciences.

Funding was provided by grants from the National Institutes of Health.

The University at Buffalo is a premier research-intensive public university, the largest and most comprehensive campus in the State University of New York. UB's more than 27,000 students pursue their academic interests through more than 300 undergraduate, graduate and professional degree programs. Founded in 1846, the University at Buffalo is a member of the Association of American Universities.
 
 
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