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Self-assembled Transition Metal Coordination Frameworks of ...

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Chapter 6<br />

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Fig. 6.3. The MALDI MS spectrum <strong>of</strong> 25. The insets are calculated isotropic<br />

distribution patterns.<br />

The compound 26 exhibits somewhat similar spectrum <strong>of</strong> 24 attributed to<br />

their similar nature under ionization condition since both complexes are formed by the<br />

neutral form <strong>of</strong> respective ligands. The peaks <strong>of</strong> 26 are seen centered at m/z 915, 835,<br />

809, 754, 674, 660, 630, 608, 586, 551, 529, 469, 447, 407, etc. Two main peaks<br />

centered at 529 and 447 are assigned with well agreeing calculated isotropic<br />

distribution patterns as [Zn(H2L3)Br]+ (calc. 529), [Zn(HL3)]+ (calc. 447). The base<br />

peak at 407 was assigned as a dissociated species ZnC;(,H,9N6+ (calc. 407) with well<br />

agreeing calculated isotropic distribution pattern. The spectrum with simulation<br />

patterns is given in Fig. 6.4. The other main peaks are found to show in agreement<br />

with simulation pattem as [Zn(H2L3)2Br]+ (calc. 913), [Zn2(H2L3)Br3]+ (calc. 755),<br />

[Zn2(HL3)Br2]+ (calc. 673). However, presence <strong>of</strong> peak centered at 1908 as given in<br />

Fig. 6.5 also obtained though with very low intensity, for which a possible impurity <strong>of</strong><br />

formula [Zn4(HL3)2(L3)2Br- 2H2O]+ (calc. 1909), however, not found match well. This<br />

240

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