(couleur) grey (Grande-Bretagne) , gray (USA) il fait gris it's a dull day, it's a grey day. faire grise mine to look morose. faire grise mine Ã  qn to give sb a cool reception.
In electrophilic aromatic substitution, the benzene ring acts as an electron donor (Lewis base or nucleophile) and reacts with an electron acceptor (Lewis acid or electrophile). The result of electrophilic aromatic substitution reactions is that an aromatic hydrogen is replaced by some other atom or functional group.
Monodentate Ligands. Monodentate ligands have only one atom capable of binding to a central metal atom or ion. H 2 0 and NH 3 are examples of neutral monodentate ligands. When H 2 0 is a ligand, oxygen is the donor atom binding to the metal.When NH 3 is a ligand, nitrogen is the donor atom binding to the metal.identate ligands have two atoms capable of binding to a central metal atom or ion. Ethane-1,2-diamine (shown in the image) is an example of a bidentate ligand. Both of the nitrogens in this molecule can act as electron donors, binding with a central metal atom or ion.