Abstract
The Co(II)–ammonia complex solution, which is used for deposition of Co sulphide coatings, has been investigated by the spectrophotometric method. The data from spectrophotometric analysis of a freshly prepared solution indicate that both the increase in intensity in the near UV region and the absorption peak at λ=360 nm are determined by intermediate Co ammonia binuclear peroxo and hydro-peroxo complexes. When these complexes dominate in solution high quality Co sulphide coatings are deposited. With solution ageing a new absorption peak emerged at λ=515 nm as a result of the formation of a final Co(III)–ammonia complex without bridge links and subsequently no Co sulphide coating formed.
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