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Designed Topology and Site‐Selective Metal Composition in Tetranuclear [MM′⋅⋅⋅M′M] Linear Complexes
Author(s) -
Barrios Leoní A.,
Aguilà David,
Roubeau Olivier,
Gamez Patrick,
RibasAriño Jordi,
Teat Simon J.,
Aromí Guillem
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200901534
Subject(s) - crystallography , antiferromagnetism , ligand (biochemistry) , topology (electrical circuits) , pyridine , molecule , cluster (spacecraft) , metal , chemistry , transition metal , yield (engineering) , benzene , quantum yield , stereochemistry , materials science , physics , medicinal chemistry , catalysis , condensed matter physics , biochemistry , receptor , mathematics , organic chemistry , combinatorics , quantum mechanics , computer science , metallurgy , fluorescence , programming language
The ligand 1,3‐bis[3‐oxo‐3‐(2‐hydroxyphenyl)propionyl]benzene (H 4 L), designed to align transition metals into tetranuclear linear molecules, reacts with M II salts (M=Ni, Co, Cu) to yield complexes with the expected [MM⋅⋅⋅MM] topology. The novel complexes [Co 4 L 2 (py) 6 ] ( 2 ; py=pyridine) and [Na(py) 2 ][Cu 4 L 2 (py) 4 ](ClO 4 ) ( 3 ) have been crystallographically characterised. The metal sites in complexes 2 and 3 , together with previously characterised [Ni 4 L 2 (py) 6 ] ( 1 ), favour different coordination geometries. These have been exploited for the deliberate synthesis of the heterometallic complex [Cu 2 Ni 2 L 2 (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.