Pengguna:Agung.karjono/Bak pasir/Sal amoniak: Perbedaan antara revisi

{{main|Kompleks logam amina}}

[[File:Tetraamminediaquacopper(II)-3D-balls.png|thumb|[[Model bola dan batang]] kation tetraaminadiakuatembaga(II), {{chem|[Cu(NH|3|)|4|(H|2|O)|2|]|2+}}]]

Ammonia can act as a [[ligand]] in [[transition metal]] [[complex (chemistry)|complexes]]. It is a pure σ-donor, in the middle of the [[spectrochemical series]], and shows intermediate [[HSAB concept|hard-soft]] behaviour. For historical reasons, ammonia is named '''ammine''' in the nomenclature of [[coordination compound]]s. Some notable ammine complexes include tetraamminediaquacopper(II) ([Cu(NH₃)₄(H₂O)₂]²⁺), a dark blue complex formed by adding ammonia to a solution of copper(II) salts. Tetraamminediaquacopper(II) hydroxide is known as [[Schweizer's reagent]], and has the remarkable ability to dissolve [[cellulose]]. Diamminesilver(I) ([Ag(NH₃)₂]⁺) is the active species in [[Tollens' reagent]]. Formation of this complex can also help to distinguish between precipitates of the different silver halides: [[silver chloride]] (AgCl) is soluble in dilute (2M) ammonia solution, [[silver bromide]] (AgBr) is only soluble in concentrated ammonia solution, whereas [[silver iodide]] (AgI) is insoluble in aqueous ammonia.