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• W2003157597 abstract "Abstract Two one‐dimensional compounds composed of a 1:1 ratio of Mn III salen‐type complex and Ni II oximato moiety with different counter anions, PF 6 − and BPh 4 − , were synthesized: [Mn(3,5‐Cl 2 saltmen)Ni(pao) 2 (phen)]PF 6 ( 1 ) and [Mn(5‐Clsaltmen)Ni(pao) 2 (phen)]BPh 4 ( 2 ), where 3,5‐Cl 2 saltmen 2− = N , N ′‐(1,1,2,2‐tetramethylethylene)bis(3,5‐dichlorosalicylideneiminate); 5‐Clsaltmen 2− = N , N ′‐(1,1,2,2‐tetramethylethylene)bis(5‐chlorosalicylideneiminate); pao − =pyridine‐2‐aldoximate; and phen=1,10‐phenanthroline. Single‐crystal X‐ray diffraction study was carried out for both compounds. In 1 and 2 , the chain topology is very similar forming an alternating linear chain with a [‐Mn III ‐ON‐Ni II ‐NO‐] repeating motif (where ‐ON‐ is the oximate bridge). The use of a bulky counteranion, such as BPh 4 − , located between the chains in 2 rather than PF 6 − in 1 , successfully led to the magnetic isolation of the chains in 2 . This minimization of the interchain interactions allows the study of the intrinsic magnetic properties of the chains present in 1 and 2 . While 1 and 2 possess, as expected, very similar paramagnetic properties above 15 K, their ground state is antiferromagnetic below 9.4 K and paramagnetic down to 1.8 K, respectively. Nevertheless, both compounds exhibit a magnet‐type behavior at temperatures below 6 K. While for 2 , the observed magnetism is well explained by a Single‐Chain Magnet (SCM) behavior, the magnet properties for 1 are induced by the presence in the material of SCM building units that order antiferromagnetically. By controlling both intra‐ and interchain magnetic interactions in this new [Mn III Ni II ] SCM system, a remarkable AF phase with a magnet‐type behavior has been stabilized in relation with the intrinsic SCM properties of the chains present in 1 . This result suggests that the simultaneous enhancement of both intrachain ( J ) and interchain ( J′ ) magnetic interactions (with keeping J ≫ J′ ), independently of the presence of AF phase might be an efficient route to design high temperature SCM‐based magnets." @default.
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• W2003157597 date "2010-03-16" @default.
• W2003157597 modified "2023-10-18" @default.
• W2003157597 title "Three-Dimensional Antiferromagnetic Order of Single-Chain Magnets: A New Approach to Design Molecule-Based Magnets" @default.
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• W2003157597 doi "https://doi.org/10.1002/chem.200902861" @default.
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