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Table 1 The λ max and molar absorptivities of different classes of compounds

From: Benzimidazole, coumrindione and flavone derivatives as alternate UV laser desorption ionization (LDI) matrices for peptides analysis

S.N Matrix classes Structure λmax (nm) єa Log є
  Class (I) Benzimidazole derivatives    
1. 4-(1H-Benzimidazol-2-yl)phenol 299 19041 4.3
2. 5-(1H-Benzimidazol-2-yl)-2-ethoxyphenol hydrate 229 16437 4.2
3. 2-(3-Chlorophenyl)-1H-benzimidazole 298 10987 4.0
4. 2-(1-Naphthyl)-1H-benzimidazole 230 13705 4.1
5. 2-(3,4-Dimethoxyphenyl)-1-phenyl-1H- benzimidazole 223 24942 4.4
6. 2-(1H-Benzimidazol-2-yl)-5-hydroperoxyphenol 315 20238 4.3
7. 2-(4-Isopropylphenyl)-1H-benzimidazole 298 19812 4.3
8. 3-(1H-Benzimidazol-2-yl) phenol 213 7143 3.8
9. 2-(1H-Benzimidazol-2-yl)-4-chlorophenol 214 9313 4.0
10. 2-(4-Ethoxyphenyl)-1H-benzimidazole 298 14002 4.1
11. N, N-Dimethyl-4-(1-phenyl-1H-benzimidazol-2-yl) aniline 325 28295 4.4
12. 2-(3,4-Dimethoxyphenyl)-1H-benzimidazole 298 15107 4.2
13. 2-(3,4-Dichlorophenyl)-1H-benzimidazole 309 17452 4.2
14. 2-(1H-Benzimidazol-2-yl)-1,4-benzenediol 213 13545 4.1
  Class-11 (Coumarin derivative)    
15. 3-[(5-Methyl-2-furyl)methylidene]-2H-chromene-2,4-dione 213 16009 4.2
16. 3-[(2-Bromophenyl)methyl idene]-2H-chromene-2,4-dione 213 10209 4.0
17. 3-[(2-Nitrophenyl)methyl idene]-2H-chromene-2,4-dione 214 16985 4.2
18. 3-[(2,4-Dihydroxy phenyl)methylidene]-2H-chromene-2,4-dione 212 15120 4.2
19. 3-[2-Furylmethylidene]-2H-chromene-2,4-dione 214 16067 4.2
20. 3-[(2,3,4-Trihydroxyphenyl) methyl idene]-2H-chromene-2,4-dione 213 16720 4.2
21. 3-[(2-Ethoxyphenyl)methyl idene]-2H-chromene-2,4-dione 213 23618 4.4
22. 3-[(2-Hydroxy-3-methoxy phenyl)methylidene]-2H-chromene-2,4-dione 214 11682 4.1
23. 3-[(2-Fluorophenyl) methylidene]-2H-chromene-2,4-dione 213 13596 4.1
24. 3-[(3-Fluorophenyl) methylidene]-2H-chromene-2,4-dione 279 21981 4.3
25. 3-[(4-Hydroxyphenyl)methyl idene]-2H-chromene-2,4-dione 298 16720 4.2
26. 4-Methyl-2H-chromen-2-one 324 5779 3.8
  Class-III (Flavones)    
27. 7-Hydroxy-2-phenyl-4H-chromen-4-one 306 17642 4.2
28. 5-Methyl-2-phenyl-4H-chromen-4-one 261 15211 4.2
29. 5,7-Dihydroxy-2-phenyl-4H-chromen-4-one 268 22629 4.4
30. 2-(3,4-Dimethoxyphenyl)-4H-chromen-4-one 334 17175 4.2
31. 2-(3,4-Dimethoxyphenyl)-7-methyl-4H-chromen-4-one 334 14432 4.1