Studies From V.V. Ghazaryan And Co-Researchers Update Current Data O

[Andres-Papazian]

STUDIES FROM V.V. GHAZARYAN AND CO-RESEARCHERS UPDATE CURRENT DATA ON AMINO ACIDS

Science Letter
December 28, 2010

According to recent research published in the Journal of Molecular
Structure, "The crystal structure of the mixed salt L-lysinium(+)center
dot center dot center dot L-lysinium(2+) dichloride-tetrafluoroborate
((L-Lys(+)center dot center dot center dot-L-Lys(2+))center dot
2Cl(-)center dot BF4-) has been determined."

"The crystal is orthorhombic (space group P2(1)2(1)2(1)) and comprises
dimeric (L-Lys(+)center dot center dot center dot L-Lys(2+))
cations in fully extended configuration, as well as Cl- and BF4-
anions. The vibrational spectra of (L-Lys(+)center dot center dot
center dot L-Lys(2+))center dot 2Cl(-)BF(4)(-), as well as those of the
previously reported mixed salts (L-Lys(+)center dot center dot center
dot L-Lys(2+))center dot 2Cl(-)center dot ClO4- and (L-Lys(+)center
dot center dot center dot L-Lys(2+))center dot 2Cl(-)center dot NO3-
have been recorded and were found to be characterized by the presence
of a band near 1680 cm(-1), characteristic for the dimeric cation
(L-Lys(+)center dot center dot center dot L-Lys(2+))," wrote V.V.

Ghazaryan and colleagues (see also Amino Acids).

The researchers concluded: "Previously published spectra ascribed
to (L-Lys(+)center dot center dot center dot L-Lys(2+))center dot
2Cl(-)center dot NO3-, containing a band near 1734 cm(-1), probably
relate to L-Lys(2+)center dot CI--NO3- crystals."

Ghazaryan and colleagues published their study in the Journal of
Molecular Structure (Mixed salts of amino acids: On the vibrational
spectra of mixed salts containing a L-lysinium(+)center dot center
dot center dot L-lysinium(2+) dimeric cation. Journal of Molecular
Structure, 2010;982(1-3):145-151).

For additional information, contact A.M. Petrosyan, NAS Armenia,
Institute Applied Problems Physics, 25 Nersessyan Str, Yerevan 0014,
Armenia.

The publisher's contact information for the Journal of Molecular
Structure is: Elsevier Science BV, PO Box 211, 1000 AE Amsterdam,
Netherlands.




From: A. Papazian