Self-assembled Transition Metal Coordination Frameworks of ...

.- 60- I ‘J
TZinc(Il) & Cadmium(lI) complexes
100j
I
Al\\ ,
Fig. 6.21. IR spectrum of Zn(II) carbohydrazone square grid complex 29.
~.?\_
'I
I
I
F
/_
1
r
I
Y‘~\/ . - . 1 \ _ .' I ll v J , lg x ,\ p F ‘» \ U _»\)/ \ ‘._ A’ "\_|\ / f 7 ~-I-, ,1 ‘I
r / 5 / v , ,5] \ u
r/ \~. X] \ \‘- ./bx/\", I ‘E _') \\ A/\"\ . #1 \" " \ __;\ \ I ,'
' I’ I‘ ‘l i \\ i: V “\. .'. “l/V‘ "\ . _\’\\/ I‘ / / /‘ \ v/ 1‘ I
“ -1 ‘I / J '1 I ‘i’ \(~-- ‘ V \ I’
l.;.4
* 1
v
'. .. ~_.._.. ..I.--.2_._.___..._.---_. , ._, .. . Y .._..._......r_....-._...._ _ _
40- .
20­
9 T ' | ' I ' | ' | ' I I | ' | ' |
4000 3500 3000 2500 2000 1500 1000 500 0
Wavenumber (cm"l
. \‘
wmwmumhr(awfl
Fig. 6.22. Far IR spectrum of Zn(II) carbohydrazone complex 29.
The IR spectra of two Cd(II) complexes show some similar features, which
are attributed to the free nitrate groups present in both complexes. The very strong
band at ~l380 cm" (v3) is characteristic, different from the v(C=N) and v(C=C)
vibrations, and weak bands at ~840 (v2) and at ~710 cm" (v4) clearly supports the
uncoordinated nature of nitrate group [37]. Also, the absence of any bands in the
region 1700-1800 cm" rules out the possibility of any coordinated nitrate groups. The
255