Self-assembled Transition Metal Coordination Frameworks of ...

Chapter 4
The spectrum of Cu(II) carbohydrazone complex 13 is as shown in Fig. 4.7.
The base peak centered at m/z 485 is assigned as [Cu(HL4)]+ (calc. 484) and another
major peak at 423 is assigned as that of the free ligand and their coordinated species,
may be formed under MALDI ionization condition, is seen as a weaker peak at 907
corresponding
.,o_
[Cu(HL4)(I-I2L4)]+ (calc. 906).
485
so-'3 _ 413 3
7°‘ so ‘T‘°° 1 906 1
moi1 .
59-1_
6o_-H. - l I 40? we 225 mm
30"_
ass
‘oi Mu:IC}nrga
.----.-_. L...------..
_ 445 911 910
: ‘ MualCha:ge sao $7 W7
1) 909
m._.
341
10 - 75 3 '99 235 243 297 T 60° 541 011 010
0-1 7“ 9111314010291 n-n'|1'rn11"ur]r|n|tn|||-rt-|]111q 2532043“ 3“ 39° "1 49° -568 ,,, 662 ?_T'? 117793 ans h 911
100 150 2% 250 300 350 400 450 5% 550 BOO 850 700 750 BOO 850 900 950
100­ -I_ 484
MasalCNrpo
Fig. 4.7. MALDI MS spectrum of compound 13. Insets are calculated isotropic
distribution patterns.
The spectra of complexes 14 to 17 are found not good enough to get
characteristic peaks. This is attributed to the less stability of these carbohydrazone
copper complexes in solution and/or under the condition of MALDI. A very weak
peak centered at 567 is assigned to [Cu(H;L4)Br]+ (calc. 566) for compound 15 (Fig.
4.8).
The base peak of 18 and 19 at m/z 369 are of the free ligand H2L°. The
spectrum of 18 (Fig. 4.9) exhibits a characteristic peak at 431 [Cu(HL°)] + (calc. 430)
and a new coordinated species at 799 [Cu(HL°)(H2L6)] +(calc. 798) as weaker peak.
140