Report No xxxx - Instytut Fizyki JÄ drowej PAN

ln T 1Q
3
2
1
0
100 200 300 400
7
3
1
T 1
[ms]
-1
ν Q2
ν Q1
-2
12 10 8 6 4 2
10 3 /T [K -1 ]
Fig.2. Temperature dependence of 35 Cl-NQR spin-lattice relaxation time in p,p′-DDA.
ln T 1
6
5
4
3
T [K]
100 200 300 400
200
150
100
50
T 1
[s]
2
12 10 8 6 4 2
10 3 /T [K -1 ]
Fig.3. Temperature dependence of 1 H-NMR spin-lattice relaxation time in p,p′-DDA.
At the present stage of the study it is difficult to unambiguously conclude about the dominant
relaxation mechanism and the dominant molecular motion in p,p`-DDA. It is expected that the
problem will be solved in further study. Perhaps, as it has been established by Pajzderska et al., [3] for
tetraphenyltin [Sn(C 6 H 5 ) 4 ], also in p,p′-DDA the motions are small amplitude
reorientations/oscillations of phenyl rings.
REFERENCES:
1. A.Nowacka, Badanie struktury elektronowej i dynamiki molekularnej insektycydu p,p`-DDA metodą
spektroskopii jądrowego rezonansu kwadrupolowego, praca magisterska, UAM (2001).
2. L.Różański, Przemiany pestycydów w organizmach żywych i środowisku, Państwowe Wydawnictwo
Rolnicze i Leśne, Warszawa (1992).
3. A.Pajzderska, J.Wąsicki, S.Lewicki, Z.Naturforsch. 54a, 488-494 (1999).
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