Issue 15, 2019

Macrocyclic complexes of Pt(ii) and Rh(iii) with iso-tellurazole N-oxides

Abstract

Pt(II) and Rh(III) readily form complexes with 3-methyl-5-aryl-1,2-tellurazole 2-oxides (L = (3-Me-5-Ar-1,2-C3HTe(NO)). The aryl group is either phenyl or 3,5-di-tert-butylphenyl, the latter case being a new derivative with enhanced solubility. The compound [Pt(3-Me-5-(3,5-tBu2C6H3)-1,2-C3HTe(NO))4](BF4)2 crystallizes in the P21/C space group featuring a square planar complex in the lattice. The crystal of [RhCl2(3-Me-5-(C6H5)-1,2-C3HTe(NO))4](BF4) belongs to the I[4 with combining macron] space group and contains an octahedral complex. In both instances, the iso-tellurazole N-oxide molecules are linked by Te⋯O chalcogen bonding interactions confirming an annular tetramer that binds the metal ion as a κ4Te macrocycle in a boat conformation. Low-frequency shifts of the 125Te magnetic resonance upon coordination and the observation of 125Te–195Pt and 125Te–103Rh 1J coupling constants indicate that the complexes are stable species in solution. The complex ions were also observed in the electrospray mass spectra.

Graphical abstract: Macrocyclic complexes of Pt(ii) and Rh(iii) with iso-tellurazole N-oxides

Supplementary files

Article information

Article type
Paper
Submitted
01 Cʼhwe. 2019
Accepted
11 Meur. 2019
First published
11 Meur. 2019

Dalton Trans., 2019,48, 4879-4886

Macrocyclic complexes of Pt(II) and Rh(III) with iso-tellurazole N-oxides

P. C. Ho, R. Bui, A. Cevallos, S. Sequeira, J. F. Britten and I. Vargas-Baca, Dalton Trans., 2019, 48, 4879 DOI: 10.1039/C9DT00500E

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