Infrared absorption curves have been obtained in the 2-15 µ region for a series of metal chelates of 2-(2-pyridyl)-and 2-(o-hydroxyphenyl) -derivatives of benzimidazole, imidazoline, benzoxazole and benzothiazole. Use was made of the potassium bromide pressed pellet technique for the preparation of samples. Particular attention has been focussed on the 3 µ region in order to observe the effects of coordination on the N-H stretching frequency. Coordination of the reagent with a metal ion decreases the N-H stretching frequency. This is explained in terms of resonance structures.Evidence is given for an intramolecular chelate structure in 2-( o-hydroxyphenyl) -benzimidazole. 2-(o-Hydroxyphenyl) -benzoxazole and its chelates have an absorption band at 8.0 µ (1250 kayser) which undergoes a regular shift, paralleling the usual stability order of the metals. The copper(II) chelate is at the highest frequency.