| prov:value
| - Here, the neutral ligand is a ligand having neither anion nor cation, and nitrogen-containing ligands such as 2,2???-bipyridyl, 1,10-phenanthroline, methylenebisoxazoline, N,N???-tetramethylethylenediamine and the like; tertiary phosphine ligands such as triphenylphosphine, tritolylphosphine, tributylphosphine, triphenoxyphosphine and the like; and other ligands are exemplified, and nitrogen-conta
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