Peng K, Friedrich A, Schatzschneider U. 2,2':6',2''-Terpyridine switches from tridentate to monodentate coordination in a gold(iii) terpy complex upon reaction with sodium azide.
Chem Commun (Camb) 2019;
55:8142-8145. [PMID:
31240290 DOI:
10.1039/c9cc04113c]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Reaction of [AuCl(terpy-κ3-N1,1',1'')]Cl2 with an excess of sodium azide did not result in the expected exchange of the chlorido by an azido ligand to give [Au(N3)(terpy-κ3-N1,1',1'')]2+. Instead, X-ray structure analysis showed that the isolated product is [Au(N3)3(terpy-κ1-N1)], in which the terpyridine ligand is in a very rare monodentate coordination mode. This is also the dominant species in solution, together with a minor amount of [Au(N3)2(terpy-κ2-N1,1')]+. The stability of the tris(azido)gold(iii) moiety relative to other possible species was also confirmed by DFT calculations.
Collapse