The coordination geometry around the iron center in complex 1 is a distorted octahedron, which is calculated using the continuous shape measures (CShM) program 104 (Table ), where the iron with an average Fe(2)-N bond distance of 2.154 Å (Table and Figure ). The Fe(2)-N bond distances are slightly lower than those observed at 280 K (vide supra) and lie in the range expected for HS iron(II), ; however significantly higher than those obtained at 110 K (vide infra). For other [Fe(L)(bik*)] 2+ site, the average Fe(1)-Nam, Fe(1)-Npy and Fe(1)-Nbik* bond distances are 2.166, 1.918, and 1.974 Å respectively with an average Fe(1)-N bond distance of 2.019 Å (Table and Figure ), where average Fe(1)-N bond distance is significantly lower than the one observed at 280 K and lies in the range expected for LS iron(II) ion in a distorted octahedral geometry with FeN6 surrounding, but slightly higher than the values obtained at 110 K (vide infra). In ), which are significantly higher than the value observed at 280 K and slightly lower than that observed at 110 K (vide infra).