Issue 48, 2011
From the journal:

Dalton Transactions

Probing Lewis acidity of Y(BH4)3via its reactions with MBH4 (M = Li, Na, K, NMe4)†‡

Tomasz Jaroń*a  and  Wojciech Grochala*ab  

* Corresponding authors

a Faculty of Chemistry, The University of Warsaw, Pasteura 1, Warsaw, Poland
E-mail: tjaron@chem.uw.edu.pl

b ICM, The University of Warsaw, Pawińskiego 5a, Warsaw, Poland
E-mail: wg22@cornell.edu

Abstract

High-energy milling of Y(BH4)3 (containing LiCl as a by-product, which has not been removed) with MBH4 (M = Li, Na, K, (CH3)4N) leads to the first two examples of quasi-ternary yttrium borohydrides: KY(BH4)4 and (CH3)4NY(BH4)4, while no chemical reaction is observed for LiBH4 and NaBH4. KY(BH4)4 is isostructural to NaSc(BH4)4 (Cmcm, a = 8.5157(4) Å, b = 12.4979(6) Å, c = 9.6368(5) Å, V = 1025.62(9) Å3, Z = 4), while (CH3)4NY(BH4)4 crystallises in primitive orthorhombic cell, similarly to KSc(BH4)4 (Pnma, a = 15.0290(10) Å, b = 8.5164(6) Å, c = 12.0811(7) Å, V = 1546.29(17) Å3, Z = 4). The thermal decomposition of hydrogen-rich KY(BH4)4 (8.6 wt.% H) involves the formation of an unidentified intermediate at 200 °C and recovery of KBH4 at higher temperatures; at 410 °C, KCl and YH2 are observed. The thermal decomposition of (CH3)4NY(BH4)4 occurs via two partly overlapping endothermic steps with concomitant emission of H2 and organic compounds. Heating of a NaBH4/Y(BH4)3 mixture above 165 °C results in a mixed-cation mixed-anion borohydride, NaY(BH4)2Cl2, but not NaY(BH4)4. The reduced reactivity of Y(BH4)3 towards borohydride Lewis bases when compared to hypothetical scandium borohydride can be explained by the lower Lewis acidity of Y(BH4)3 than Sc(BH4)3.

Graphical abstract: Probing Lewis acidity of Y(BH4)3via its reactions with MBH4 (M = Li, Na, K, NMe4)

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/C1DT10955C
Article type
Paper
Submitted
21 May 2011
Accepted
06 Sep 2011
First published
03 Nov 2011

Dalton Trans., 2011,40, 12808-12817

Permissions

Request permissions

Probing Lewis acidity of Y(BH4)3via its reactions with MBH4 (M = Li, Na, K, NMe4)

T. Jaroń and W. Grochala, Dalton Trans., 2011, 40, 12808 DOI: 10.1039/C1DT10955C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements