Designed Topology and Site‐Selective Metal Composition in Tetranuclear [MM′⋅⋅⋅M′M] Linear Complexes |
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| Authors: | Leoní?A Barrios Dr David Aguilà Olivier Roubeau Dr Patrick Gamez Dr Jordi Ribas‐Ariño Dr Simon?J Teat Dr Guillem Aromí Dr |
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| Institution: | 1. Facultat de Química, Departament de Química Inorgànica, Universitat de Barcelona Diagonal 647, 08028 Barcelona (Spain), Fax: (+34)?934907725;2. Instituto de Ciencia de Materiales de Aragón, CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza (Spain);3. Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden (The Netherlands);4. Lehrstuhl für Theoretische Chemie, Ruhr‐Universit?t‐Bochum, 44780 Bochum (Germany);5. Advanced Light Source, Berkeley Laboratory, 1 Cyclotron Road, MS2‐400, Berkeley, CA 94720 (USA) |
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| Abstract: | The ligand 1,3‐bis3‐oxo‐3‐(2‐hydroxyphenyl)propionyl]benzene (H4L), designed to align transition metals into tetranuclear linear molecules, reacts with MII salts (M=Ni, Co, Cu) to yield complexes with the expected MM???MM] topology. The novel complexes Co4L2(py)6] ( 2 ; py=pyridine) and Na(py)2]Cu4L2(py)4](ClO4) ( 3 ) have been crystallographically characterised. The metal sites in complexes 2 and 3 , together with previously characterised Ni4L2(py)6] ( 1 ), favour different coordination geometries. These have been exploited for the deliberate synthesis of the heterometallic complex Cu2Ni2L2(py)6] ( 4 ). Complexes 1 , 2 , 3 and 4 exhibit antiferromagnetic interactions between pairs of metals within each cluster, leading to S=0 spin ground states, except for the latter cluster, which features two quasi‐independent S=1/2 moieties within the molecule. Complex 4 gathers the structural and physical conditions, thus allowing it to be considered as prototype of a two‐qbit quantum gate. |
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| Keywords: | heterometallic complexes ligand design magnetic properties quantum chemistry |
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