|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(03-04) [March-April 2011] >
| Title: | Synthesis, structure and properties of a high-spin Fe(III) porphyrin with non-equivalent axial ligands: Implications for the hemoproteins |
| Authors: | Chaudhary, Arvind
Patra, Ranjan
Rath, Sankar Prasad |
| Keywords: | Bioinorganic chemistry
Hemoproteins
Iron
High spin iron
Porphyrins
Mixed axial ligands |
| Issue Date: | Mar-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The synthesis and X-ray
structure of a six-coordinate (porphinato)iron(III) derivative having the
mixed-axial ligation of perchlorate and dimethylformamide with no displacement
of metal in a nonplanar porphyrinic environment is reported for the first time.
The Fe-Np (Np: porphinato nitrogen) distances which range from 2.044(2) to
2.070(2) Å, leaves little doubt that the Fe(III) ion is in high-spin state
which is also supported by its characteristic axial EPR spectrum at low
temperature. The axial Fe-O(DMF) distance is 2.050(2) Å which is ~0.6 Å shorter
than the Fe-OClO3 distance of the complex. In the complex, iron sits
in the plane of four porphyrinic nitrogens even when metal coordinates to two
non-equivalent axial ligands. The present study suggests that the displacement
of iron in proteins is the consequence of non-equivalent axial coordination as
well as the protein induced deformations at heme. |
| Page(s): | 432-437 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(03-04) [March-April 2011]
|
|
