Final answer:
Chloridobis(ethylenediamine)nitrito-kN-cobalt(III) bromide features an octahedral coordination complex with Cobalt(III) at the center, two bidentate ethylenediamine ligands, a chloride ion, and a nitrito group, leading to a coordination number of 6.
Step-by-step explanation:
The question pertains to the structure of the coordination sphere for a specific complex, chloridobis(ethylenediamine)nitrito-kN-cobalt(III) bromide. According to coordination chemistry, the central metal atom or ion is bonded to a number of molecules or ions (ligands). The correct coordination number and geometry must be determined based on ligand types and their bonding modes.
In chloridobis(ethylenediamine)nitrito-kN-cobalt(III) bromide, cobalt(III) serves as the central metal ion. It is bonded to two ethylenediamine ligands, which are bidentate, meaning each can coordinate through two donor atoms, to a single chloride ion, and to a nitrito group that coordinates through one nitrogen atom. These ligands compose the coordination sphere of the complex. With two bidentate ethylenediamine ligands (each providing two coordination sites) and one chloride and one nitrito ligand (each providing one coordination site), the coordination number of the complex is 6, resulting in an octahedral geometry.