Spectral Properties ntawm Pyridine

1. Infrared spectrum (IR) ntawm pyridine: Lub infrared spectrum ntawm aromatic heterocyclic tebchaw zoo ib yam li cov benzene tebchaw, nrog CH stretching vibration ntawm 3070-3020cm-1, aromatic nplhaib stretching vibration (skeleton band. ) ntawm 1600-1500cm-1, thiab tawm ntawm lub dav hlau bending vibration ntawm aromatic hydrogen ntawm 900-700cm-1.
2. Nuclear Magnetic Resonance Hydrogen Spectroscopy (HNMR) ntawm Pyridine: Hydrogen Nuclear Chemical Shift ntawm Pyridine thiab Benzene Nplhaib Hydrogen ( δ Piv rau hauv qhov chaw qis, cov tshuaj hloov pauv ntau dua 7.27, thiab qhov nqus siab tshaj ntawm hydrogen ntawm cov pa roj carbon. Nyob ib sab ntawm lub heteroatom yog ntau inclined mus rau qhov chaw qis, thaum muaj cov electron pub dawb pab pawg txuas nrog lub nplhaib heterocyclic, cov tshuaj hloov pauv mus rau qhov chaw siab dua, thaum lub sij hawm hloov pauv yog electrowithdrawing, tshuaj hloov pauv mus rau qhov chaw qis dua.
3. UV absorption spectrum ntawm pyridine: Pyridine muaj ob lub UV nqus bands, ib qho ntawm 240-260nm(ε= 2000) sib raug rau π → π * kev hloov pauv (zoo ib yam li benzene). Lwm kab hauv cheeb tsam 270nm sib raug rau n → π * kev hloov pauv (ε= 450).