High resolution ¹H and ¹³C NMR and mass spectral studies of substituted dipyridylpyridazine

Article type: Research Article

Authors: El‐Qisairi, Arab K.

Affiliations: Department of Chemistry, Mu'tah University, Mu'tah, Jordan E‐mail: aqaseer@yahoo.com

Abstract: Total assignment of the 1H and 13C NMR spectra of 3,6‐bis(2′‐pyridyl)pyridazine derivatives (n‐dppn) have been recorded at 400 and 100 MHz, respectively.For the n‐dppn ligands, n stands for the size of the cyclic aliphatic ring on position 4 and 5 of the pyridazine ring, n=5,6,7, 8, and 12. Based on these data, the complete assignment of the 13C NMR chemical shift values was made by a 13C{1H} decoupling. The spectra clearly show that the n‐dppn ligands exist in the cis–cis conformation at least in solution. Matrix assisted laser desorption ionization (MALDI) and time‐of‐flight mass spectrometry (TOFMS) are used to record the mass spectra of the n‐dppn ligands. α‐Cyano‐4‐hydroxycinnamic acid (CHCA) matrix promoted the molecular ion detection when 180 pmol of n‐dppn is introduced into the TOFMS.

Journal: Spectroscopy, vol. 16, no. 1, pp. 37-41, 2002