Jump to main content
Jump to site search


Synthesis, structural characterization and scalable preparation of new amino-zinc borates

Author affiliations

Abstract

Zinc borates are very important industrial materials with applications that include fire retardants and preservatives in wood. In this work, we report the preparation of three novel zinc borates: [Zn(NH3)3B4O5(OH)4]·H2O (ZB1), Zn3(H2B3O7)2·2NH3·4H2O (ZB2), and [Zn(NH3)4][B4O5(OH)4]·4H2O (ZB3). The solid phases were characterized by elemental analysis, X-ray diffraction, infrared and Raman spectroscopy, scanning electron microscopy and thermal analysis. The crystal structures of ZB1 (monoclinic, Cc, a = 12.1972(8), b = 7.8314(5), c = 12.1441(8) Å and β = 107.404(5)°) and ZB3 (orthorhombic, Pbca, a = 15.0796(9), b = 11.8853(5) and c = 16.7606(8) Å) were determined. They are novel neutral Zn-polyborate complexes [Zn(NH3)3B4O5(OH)4] hydrate and [Zn(NH3)4][B4O5(OH)4] tetrahydrate salt, respectively. The complete assignment of infrared and Raman spectra was performed theoretically using DFT calculations. For ZB2 (obtained as a polycrystalline phase), powder X-ray diffraction confirmed a single phase and allowed the determination of the unit cell parameters and lattice type (rhombohedral, a = 36.78076 (6), c = 12.20052 (3) Å) with an expected formula Zn3(H2B3O7)2·2NH3·4H2O suggesting that this compound is a complex triborate. Furthermore, a low-cost scalable synthetic procedure for ZB1 starting from zinc oxide and boric acid in ammonia solution with a high yield is also reported.

Graphical abstract: Synthesis, structural characterization and scalable preparation of new amino-zinc borates

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Aug 2017, accepted on 14 Oct 2017 and first published on 16 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT03186F
Citation: Dalton Trans., 2017, Advance Article
  •   Request permissions

    Synthesis, structural characterization and scalable preparation of new amino-zinc borates

    M. R. Imer, M. González, N. Veiga, C. Kremer, L. Suescun and L. Arizaga, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT03186F

Search articles by author

Spotlight

Advertisements