α-Ni(OH) 2 and Ni−Al layer double hydroxides (LDHs) precipitated by urea were investigated with FTIR and XPS. Possible modes of cyanate (CNO - ) coordination during the nucleation and growth of precipitates is discussed. In the early stages, cyanate ion in α-Ni(OH) 2 is found mainly to be N-bonded to Ni 2+ ions in the layers, whereas later in the growth stages, it is bonded through oxygen. In LDHs cyanate remains N-bonded. These changes in the coordinations modes are related to the decreasing supersaturation levels during digestion. XPS results support the FTIR results.
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Mavış et al. (2006) studied this question.
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