Self-assembled Transition Metal Coordination Frameworks of ...

Chapter 4
compounds has been very limited as aggregation process may arise from ion-molecule
reactions in the gas phase to complicate the spectra sometimes [20].
The complex 8 exhibits peaks centered at m/z 501.1, 467.1, 445.2, 405.2, etc
(Fig. 4.1.). The peak at 501.1 assigned as [Cu(HL')]+ (calc. 500) and at 467.1 as
100- A m
[Cu(HL')-SH]+ (calc. 468) agreeing with calculated isotropic distribution patterns.
4052
=04. MT 10%| .. S00‘TI
no us Oflj - so: "2 501.1
50
103 i ' 235.1 -
‘
5°‘ l\huICl'n.I-go
W1 i1
40-: : 233.1 --—--­ Mu:!Cl'nI~u: i
30
20;
I 189.1 423.2 211_1 409.1 427.2 . l ,
° I *1 I = I I I I T | I I I I [fiat I'Tjfi'”I"w I | I I - I | I I I I | I I I I | T I I I I I I I'"[*I I I [ I I I | I I FT1 I I [-1-] I I I I | I I I I 1'
200 zso aoo am 400 450 500 sso
MnsalCIIl|1|o
Fig. 4.1. MALDI MS spectrum of 8. II1S€l1S are calculated isotropic patterns.
The compound 9 shows peaks centered at m/z 1219, 1123, 1061, 998, 935,
561, 499, etc (Fig. 4.2). The very low intense peak at 1219 may be of the species
[Cu4L22(ClO4)-2H+]+ (calc. 1220). Other major peaks are assigned as [Cu2L2(HL2)­
CH3OH- H20? (calc. 1061), [Cu2L2(HL2)]+ (calc. 997), [Cu(H2L2)HL2]+ (calc. 934),
[Cu2L2-H+]+ (calc. 559). The base peak corresponds to [Cu(HL2)]+ (calc. 498). All
these are in well agreement with simulation (Fig. 4.3) and are characteristic peaks for
the compound which assigned as molecular formula [Cu4L22- 2H2O](ClO4)4.
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