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Dilatometric studies of reaction volumes for the formation of metal complexes in several solvents

Abstract

A convenient technique is described to determine reaction volumes by means of direct dilatometry. Reaction volumes were determined for the following complexation reactions: formation of monoamminenickel(II) in water (−0.1±0.5 cm3-mol−1); formation of the 1:1 nickel(II) complex with isoquinoline in methanol and ethanol (3.2±0.1 and 1.1±0.1 cm3-mol−1, respectively); formation of the 1:1 isothiocyanatoiron(III) complex in water, Me2SO, and DMF (8.9±0.2, 12.4±0.7, and 25.1±0.3 cm3-mol−1, respectively); formation of the 18-crown-6 potassium complex in water (10.9±0.2 cm3-mol−1). We discussed these values in terms of electrostriction and molecular size.

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Funahashi, S., Sengoku, K., Amari, T. et al. Dilatometric studies of reaction volumes for the formation of metal complexes in several solvents. J Solution Chem 17, 109–116 (1988). https://doi.org/10.1007/BF00646430

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Key words

  • Dilatometry
  • reaction volume
  • metal complex formation
  • formation constant
  • electrostriction