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Issue 19, 2019
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Metal-directed self-assembly of transition metal heterometallascorpionates

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The heterobimetallic complexes [Co(LtzE)3K(THF)2] [LtzE = [{4,5-(P(E)Ph2)2}tz]; tz = 1,2,3-triazole; E = S(3), Se(4)] featuring high-spin cobalt centres, and [Ni(LtzE)3K(THF)2] [E = S(5), Se(6)] were synthesized through the self-assembly reaction of HLtzE [E = S(1), Se(2)], KOH or K0 and MCl2 (M = Co, Ni). Compounds 3–6 exhibit an unusual metallascorpionate-type anion formed by the coordination of three triazole units via a κ2-N,E mode to the transition-metal atom, and this anion further coordinates to a potassium cation through a κ3-N′,N′′,N′′′ fashion. Compounds 3 and 5 were used in the synthesis of 3d-metal heterometallascorpionates [M(LtzS)3Cu(PPh3)] [M = Co, (7), M = Ni (8)] and the bimetallic complex [Ni(LtzE)3Ni(NO3)(THF)] (9) through metathesis reactions, pointing to stable metallascorpionate anions in solution. The solution behavior of 3–9 was investigated by UV-visible spectroscopy, high-resolution mass spectrometry, electrochemical methods and by magnetic-susceptibility measurements. The molecular structures of 3–6, 8 and 9 were determined by single-crystal X-ray diffraction studies and exhibit M⋯M′ distances ranging from 3.52 to 3.88 Å.

Graphical abstract: Metal-directed self-assembly of transition metal heterometallascorpionates

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Supplementary files

Article information

15 Feb 2019
11 Apr 2019
First published
24 Apr 2019

Dalton Trans., 2019,48, 6571-6580
Article type

Metal-directed self-assembly of transition metal heterometallascorpionates

J. Pastor-Medrano, F. R. Rodríguez-Raya, E. Bernabé-Pablo, D. A. Mireles-Chávez, V. Jancik, D. Martínez-Otero and M. Moya-Cabrera, Dalton Trans., 2019, 48, 6571
DOI: 10.1039/C9DT00683D

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