Discovery 607 monodentate ligand

For the synthesis of bidentate ligands, supramolecular approaches have led to a renaissance in homogeneous catalyst discovery (Chapters 2, 4, 8, 9,10), and in a few cases even monodentate ligands have been modified in a supramolecular fashion (Chapter 8, Section 8.2). Combinations of monodentate ligands can be left to chance and in several instances this has led to successful, new catalysts [96]. Such heterocombinations can form spontaneously for steric or electronic reasons or the reactivity of the combinations can be different such that on certain occasions highly enantioselective catalysts are obtained. There are many ways to synthesize the desired heterocombinations selectively and the ionic modification outlined in Section 10.4 is only one of them since nitration (followed by reduction to amines) and sulfonation are robust methods, the ionic route may prove useful. Hydrogen bonding between different donor-acceptors (Chapters 2 and 8), Lewis add-base interactions (Chapter... 

You have just astonished the scientific world by your discovery of a class of monodentate ligands that form cubic complexes, [MLg] ", with all of the ions of the first transition series. It is clear that, depending on the choice of L, some metals may form either high spin or low spin complexes. For which ions of the first transition series does the possibility of high and low spin cubic complexes occur ... 

Janik Bjerrum, Danish chemist. Among other discoveries, he demonstrated that monodentate ligands invariably become fixed to the central metallic ion through successive steps. He also devoted much work to the electrostatic forces that operate within solutions. 

---