In coordination chemistry, the coordination sphere includes atoms or ions around which there is an array of molecules, anions or ligands [1] [2] . Molecules that attach non-covalently with ligands are called the second coordination sphere .
Second coordination area
The second coordination sphere includes molecules that join non-covalently with the ligands that occupy the first coordination sphere. These molecules are usually solvents. The interactions between the first and second coordination spheres usually include hydrogen bonds between each other. For positively charged complexes, an ionic compound is important. The signs of solvents are expressed in complexes where the ligands are in the first coordination, with a strong bond of hydrogen donors and acceptors, for example, [Co (NH 3 ) 6 ] 3+ and [Fe (CN) 6 ] 3− . Crown esters combine with polyamine complexes through their second coordination spheres [3] .
Link Examples
In hexaaminocobaltate (II) chloride (chemical formula [Co (NH 3 ) 6 ] Cl 3 ) , the cobalt cation with six ammonia ligands is the first coordination sphere.
Notes
- ↑ (eng.) Chemistry-dictionary.com - Definition of coordination sphere
- ↑ What Is A Coordination Compound?
- ↑ Lehn, JM Supramolecular Chemistry: Concepts and Perspectives; VCH: Weinhiem, 1995.