- P-ISSN 1225-0163
- E-ISSN 2288-8985
<TEX>$^1H$</TEX> NMR spectra for monocyanide ligated ferriprotoporphyrin(hemin) complex and dicyanide coordinated hemin complex in dimethylsulfoxide(DMSO-<TEX>$d_6$</TEX>) solution have been recorded and analyzed. NMR spectra of hemin-cyanide complexation in DMSO-<TEX>$d_6$</TEX> exhibit that the cyanide ligation to hemin is temperature-dependent. Thermodynamic parameters for the monocyanide ligated hemin to dicyanide ligated hemin are consistent with endothermic process with <TEX>${\Delta}H^{\circ}