Role of Dicarboxylate Linkers in MnIII‐Salicylaldoximate Based Extended Structures: Synthesis,Structures, and Magnetic Behavior |
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| Authors: | Sandip Mukherjee Prof Dr Partha Sarathi Mukherjee |
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| Institution: | Department of Inorganic & Physical Chemistry, Indian Institution of Science, Bangalore 560 012 (India), Fax: (+91)?8023601552 |
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| Abstract: | Four new oxo‐centered MnIII‐salicylaldoximate triangle‐based extended complexes MnIII6O2(salox)6(EtOH)4(phda)]n?(saloxH2)n?(2H2O)n ( 1 ), MnIII6O2(salox)6(MeOH)5(5‐I‐isoph)]n?(3 MeOH)n ( 2 ), MnIII6O2(salox)6(MeOH)4(H2O) (5‐N3‐isoph)]n?(4 MeOH)n ( 3 ) and MnIII3NaO(salox)3(MeOH)4(5‐NO2‐isoph)]n?(MeOH)n (H2O)n ( 4 ) salox=salicylaldoximate, phda=1,3‐phenylenediacetate, isoph=isophthalate] have been synthesized under similar reaction conditions. Single crystal X‐ray structures show that in 1 , only one type of Mn6 cluster is arranged in 1 D, whereas in 2 and 3 there are two types of clusters, differing in the way the triangle units are joined and assembled. In complex 4 , however, the basic building structure is heteronuclear and based on Mn3 units extended in 2 D. Susceptibility measurements (dc and ac) over a wide range of temperatures and fields show that the complexes 1 , 2 , and 3 behave as single molecule magnets (SMMs) with S=4 ground state, while 4 is dominantly antiferromagnetic with a ground spin state S=2. Density functional theory calculations have been performed on model complexes to provide a qualitative theoretical interpretation for their overall magnetic behavior. |
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| Keywords: | carboxylates clusters coordination compounds magnetic manganese |
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