Abstract
Structurally, hydrogen bonding is identified as a key factor to domain the construction of a crystallographic frame during the crystallization of the Ln(H2O)9(CF3SO3)3 (Ln = La–Lu) system. In situ Raman spectroscopy is used to capture the hydrogen bonding dependent mesoscale frameworks that are formed during Ln(H2O)9(CF3SO3)3 crystallization in aqueous solution by continuously collecting the spectra of structural fragments. The spectral characteristics show that the isolated Ln(H2O)93+ tricapped trigonal prisms cannot exist in the aqueous solution. With the concentration of aqueous solution, the hydrated Ln3+ and CF3SO3– tend to share common H2O molecules, and new hydrogen bonding will be built surrounding Ln3+. Especially, for the Nd, Eu, Yb, and Lu system, Ln(H2O)n(CF3SO3)3 (n = 8–9) clusters instead of hydrated Ln3+ and CF3SO3– are formed in the solution. Under the guiding of intermolecular hydrogen bonds, both bond lengths and bond angles of Ln–O may be regulated, leading to the initial formation of L...
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