Correct combination of number and size of rings present in a metal ion-porphine complex (including metal ion bearing chelate rings) is
(a)four 5-membered and four 6-membered
(b)two 5-membered and six 6-membered
(c)six 5-membered and two 6-membered
(d)five 5-membered and three 6-membered
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Porphine has four five-membered pyrrole rings; chelation of the metal by the four pyrrole N atoms creates four six-membered chelate rings (M–N–C–C_meso–C–N).