Assuming a coordination complex is formed with Fe²⁺ and 1,10-phenanthroline (shown below), which of the following statements is true A) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 2. B) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. C) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 3. D) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. E) If four 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 4.

Question

Quizplus · Accepted Answer

The Fe²⁺ complex has six ligands attached to the iron ion, including one sulfur (S1) and two phosphate (P) groups. If three 1,10-phenanthroline molecules are also coordinated to the iron ion, then the coordination number would be 6 (3 from 1,10-phenanthroline molecules and 3 from the other ligands already present). Therefore, the correct choice is D.

Assuming a Coordination Complex Is Formed with Fe2+ and 1,10-Phenanthroline

Assuming a Coordination Complex Is Formed with Fe²⁺ and 1,10-Phenanthroline