L1 /   
16
CH1012
CHLOROPHYLL
 
 
Chlorophyll a1 contains Mg2+    complexed to a
                 cyclic tetradentate
                 ligand containing four
                 nitrogen atoms.
                 (chlorin ligand)
                 The pigment
                  absorbs red    
     so we
     see
     green.
(i) absorbs hn,
(ii) stores the E,
(iii) acts as a reducing agent.
Guard cells
chloroplast