Characterization and Equilibrium of Beryllium(II) Solvates [BeSn(H2O)4-n]2+(n=0-4, S=N, N-Dimethylformamide and 1, 1, 3, 3-Tetramethylurea) Studied by 9Be NMR Spectroscopy

Sen-ichi AIZAWA; Tadahiko KATO; Shigenobu FUNAHASHI

doi:10.2116/analsci.13.541

Characterization and Equilibrium of Beryllium(II) Solvates [BeS_n(H₂O)_4-n]²⁺(n=0-4, S=N, N-Dimethylformamide and 1, 1, 3, 3-Tetramethylurea) Studied by ⁹Be NMR Spectroscopy

Sen-ichi AIZAWA, Tadahiko KATO, Shigenobu FUNAHASHI

Author information

Keywords: Characterization of beryllium(II) solvate, ⁹Be NMR spectroscopy, steric effect of solvent

JOURNAL FREE ACCESS

1997 Volume 13 Issue 4 Pages 541-544

DOI https://doi.org/10.2116/analsci.13.541

Details

Published: August 10, 1997 Received: February 18, 1997 Available on J-STAGE: July 07, 2006 Accepted: May 12, 1997 Advance online publication: - Revised: -
Correction information
Date of correction: July 07, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : Beryllium(II) solvates [BeS_n(H₂O)_4-n]²⁺(n=0-4, S=N, N dimethylformamide (dmf) and 1, 1, 3, 3-tetramethylurea (tmu)) in acetonitrile have been characterized by ⁹Be NMR spectroscopy. The difference in steric effects of the bound dmf and tmu molecules on the structures of the solvates has been clarified by ⁹Be NMR chemical shifts. The stepwise formationconstants, K_n=[[BeS_n(H₂O)_4-n]²⁺][H₂O][[BeS_n-1(H₂O)_5-n]²⁺]^-1[S]^-1(n=1-4), obtained from the ⁹Be NMR signal intensities for the tmu system drastically decrease between K₁ and K₂ and between K₃ and K₄, while those for the dmf system decrease statistically with an increase in n. Such a difference in the stability of the two systems is discussed in connection with the steric effects.
Right : Beryllium(II) solvates [BeS_n(H₂O)_4-n]²⁺(n=0-4, S=N, N dimethylformamide (dmf) and 1, 1, 3, 3-tetramethylurea (tmu)) in acetonitrile have been characterized by ⁹Be NMR spectroscopy. The difference in steric effects of the bound dmf and tmu molecules on the structures of the solvates has been clarified by ⁹Be NMR chemical shifts. The stepwise formation constants, K_n=[[BeS_n(H₂O)_4-n]²⁺][H₂O][[BeS_n-1(H₂O)_5-n]²⁺]^-1[S]^-1(n=1-4), obtained from the ⁹Be NMR signal intensities for the tmu system drastically decrease between K₁ and K₂ and between K₃ and K₄, while those for the dmf system decrease statistically with an increase in n. Such a difference in the stability of the two systems is discussed in connection with the steric effects.

Date of correction: July 07, 2006 Reason for correction: - Correction: PDF FILE Details: -

Abstract

Beryllium(II) solvates [BeS_n(H₂O)_4-n]²⁺(n=0-4, S=N, N dimethylformamide (dmf) and 1, 1, 3, 3-tetramethylurea (tmu)) in acetonitrile have been characterized by ⁹Be NMR spectroscopy. The difference in steric effects of the bound dmf and tmu molecules on the structures of the solvates has been clarified by ⁹Be NMR chemical shifts. The stepwise formation constants, K_n=[[BeS_n(H₂O)_4-n]²⁺][H₂O][[BeS_n-1(H₂O)_5-n]²⁺]^-1[S]^-1(n=1-4), obtained from the ⁹Be NMR signal intensities for the tmu system drastically decrease between K₁ and K₂ and between K₃ and K₄, while those for the dmf system decrease statistically with an increase in n. Such a difference in the stability of the two systems is discussed in connection with the steric effects.

Corresponding author

Correction information

Register with J-STAGE for free!