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The Two Fundamental H-Bond Types in Acid Salts Displayed in the Dimorphs of Potassium Hydrogen Tartronate

Jan Kroon ; Laboratorium voor Structuurchemie, Rijksuniversiteit, Padualaan 8, Utrecht, The Netherlands
Jan A. Kanters ; Laboratorium voor Structuurchemie, Rijksuniversiteit, Padualaan 8, Utrecht, The Netherlands


Puni tekst: engleski pdf 5.893 Kb

str. 99-104

preuzimanja: 93

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Sažetak

At ambient temperature the acid potassium salt of tartronic
acid crystallizes in two forms. The a. form is monoclinic, space
group P21/n with a= 7.356, b = 8.116, c = 9.197 A, fJ = 94.81° and
Z = 4. The fJ form is also monclinic, space group P21/c with.
a= 6.532, b = 9.248, c = 9.505, fJ = 99.74° and Z = 4. The a. and ~
structures were solved by Patterson and Fourier methods and
refined to R = 0.047 with 1129 and 1204 observed diffractometer
data respectively. The fundamental differences in structural aspects
between the dimorphs of this acid salt are found in the H-bond
schemes. In the a. form the carboxyl groups are coupled by A-type
H bonds, in the ~ form by H bonds of the B type.

Ključne riječi

Hrčak ID:

194282

URI

https://hrcak.srce.hr/194282

Posjeta: 220 *