From: A density functional theory study of Fe(II)/Fe(III) distribution in single layer green rust: a cluster approach
GR cluster model
Fe(II)/Fe(II) ratio
Charge
NUE
GR2 × 6
0/7 to 7/0
− 3 to -10
35 to 28
GR3 × 6
0/19 to 19/0
 + 3 to -16
95 to 76
GR4 × 6
0/37 to 37/0
 + 15 to -22
185 to 148