THE FE2+ CHELATE OF HYDRAZINECARBOXYLIC ACID STUDIED BY THE MÖSSBAUER EFFECT

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Submitted on 1 Jan 1980

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THE FE2+ CHELATE OF

HYDRAZINECARBOXYLIC ACID STUDIED BY THE MÖSSBAUER EFFECT

D. Hanžel, F. Sev¡ek

To cite this version:

D. Hanžel, F. Sev¡ek. THE FE2+ CHELATE OF HYDRAZINECARBOXYLIC ACID STUDIED BY THE MÖSSBAUER EFFECT. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-353-C1-353.

�10.1051/jphyscol:19801132�. �jpa-00219616�

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JOURNAL DE PHYSIQUE Colloque C l , suppldment au n O 1 , Tome 41, janvier 1980, page C1-353

M E ~ e CHELATE OF HYDRAZINECARBOXYLIC ACID STUDIED BY ~ + M E M~~SSBAUER EFFECT

D. ~ a n i e l and F . ~ e v g e k

J . S t e f a n I n s t i t u t e , University of Ljubljana, Ljubljana, YugosZavia.

Chelate compounds ~[~e(hyc)~] and N A [~e(hyc)~].H~O (hyc-4 H COO) have been studied

2

5

2

3

by Mgssbauer effect of 57~e. The temperature dependence of the quadrupole splitting parameters which were 2.77mm/s for ~[~e(hyc)4 and 2.3~mm/s for

~ ~ ~ b ~ e ( h y c ) d

^{H20 at}

room temperature yielded the crystal field splitting of the ferrous T levels:

&=-970cm-' for K [~e(h~c and st=-708cm-l, C -137cm-l for N$15 [~e(hyc 2g j] .H20.

Considering also the crystallographic data and single crystal measurements the sym- metry of the ~ e ( h y c ) ~ anion is considered predominantly trigonal with orbitally nondegenerate ferrous ion ground state in both compounds. The center shifts were the same within experimental error for both here studied compounds and their temperature dependence was explained by the second order Doppler shift and thermal volume

expansion. The temperature dependences of recoilless fractions were interpreted by molecular crystal-like vibrations of ferrous ions which yielded an effective Debye temperature of 71 K for ~[Fe(hyc)~]and

90

K for ~;~i~[~e(hyc)~] .H20 No evidence for magnetic ordering was found down to

4.5

K.

Published in Journal of Solid State Chemistry

3,

³⁸⁵ ⁽¹⁹⁷⁹⁾

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801132