Ammine
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In coordination chemistry an ammonia ligand is called an ammine. In contrast to alkyl amines it is spelled with a double "m". Cobalt(III) salts frequently actually contain hexaamminecobalt(III) (ex. cobalt(III) chloride [Co(NH3)6]Cl3). Tetraamminedichlorochromium(III) chloride ([Cr(NH3)4Cl2]Cl) has the unique property that the cis isomer is violet and the trans isomer is green. Tetraamminecopper(II) ([Cu(NH3)4]+2) is a much deeper blue than the bare copper ion. Formation of the diamminesilver ion ([Ag(NH3)2]+) allows the generally insoluble silver chloride to dissolve in aqueous ammonia.
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