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Synthesis and Structure of a Tetranuclear Nickel Complex of a 40-Membered Macrocyclic Octaamine-Tetrathiophenolate Ligand

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Synthesis and Structure of a Tetranuclear Nickel Complex of a 40-Membered Macrocyclic Octaamine-Tetrathiophenolate Ligand

Berthold Kersting

Institut f¨ur Anorganische und Analytische Chemie, Universit¨at Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany

Reprint requests to Dr. B. Kersting. E-mail: kerstber@sun2.ruf.uni-freiburg.de Z. Naturforsch.55 b,961–965 (2000); received July 7, 2000

Macrocyclic Ligands, Thiolate Ligand, Polynuclear Complexes

The syntheses and characterization of tetranuclear Ni complexes [(L2)Ni4][ClO4]4(3) and [(L2)Ni4(NCS)4] (4) of a 40-membered macrocyclic octaamine-tetrathiophenolate ligand (L2)4 are described. Single-crystal X-ray structure analysis of4reveals well-separated molecules of the tetranuclear isothiocyanate complex [(L2)NiII4(NCS)4]. The four NiIIcenters are arranged in binuclear [N2Ni(2-SR)2NiN2(NCS)2] subunits containing distorted square-planar NiN2S2

and distorted octahedral NiN2S2(NCS)2sites. The fact that the two isothiocyanate groups at the octahedral Ni site are in trans positions can be ascribed to the large ring size of the macrocycle.

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