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Table 1 Vibrational frequency analysis using B3LYP/6-31G(d) method

From: A new phenothiazine-based selective visual and fluorescent sensor for cyanide

StructurePTZONPTZON-CN
AssignmentFrequency (cm−1)
C=O17741723
C≡N(2314–2333)(2268–2298)–2350*
  1. The frequency between parenthesis are those for C–N bond present in both PTZON and PTZON-CN
  2. The frequency with a asterisk correspond to the added CN to the PTZON that is why it does not appear in the former one (PTZON)