Ligand exchange reaction in open-face [Cu4(µ3 -OH)2 ] cubane aggregates: Synthesis, structural change and difference in magnetic interactions
GHOSH, Aloke Kumar
Department of Chemistry, Indian Institute of Technology
Department of Chemistry, Prabhat Kumar College
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Department of Chemistry, Indian Institute of Technology
Department of Chemistry, Prabhat Kumar College
GHOSH, Aloke Kumar
Department of Chemistry, Indian Institute of Technology
Department of Chemistry, Prabhat Kumar College
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Department of Chemistry, Indian Institute of Technology
Department of Chemistry, Prabhat Kumar College
Language
en
Article de revue
This item was published in
Polyhedron. 2018-05, vol. 146, p. 136-144
Elsevier
English Abstract
Distorted [Cu4(m3-OH)2] cubane type arrangements, one tetracationic and one neutral, have been achieved as [Cu2(m-H2bpmp)(m3OH)(H2O)]2(SO4)2.3H2O.CH3OH (1) and [Cu2(m-Hbpmp)(m3-OH) (m1,3-O2CCF3)]2.H2O.2CF3CO2H (2) [H3bpmp ...Read more >
Distorted [Cu4(m3-OH)2] cubane type arrangements, one tetracationic and one neutral, have been achieved as [Cu2(m-H2bpmp)(m3OH)(H2O)]2(SO4)2.3H2O.CH3OH (1) and [Cu2(m-Hbpmp)(m3-OH) (m1,3-O2CCF3)]2.H2O.2CF3CO2H (2) [H3bpmp = 2,6-bis-[(3 hydroxypropylimino)methyl]-4-methylphenol] from the reactions of H3bpmp with CuSO4.5H2O and Cu(CF3CO2)2.xH2O in the presence of NEt3in MeOH medium. Two types of apical interactions of the CuII ion with H2O and CF3CO2. induced hydroxido- bridge supported aggregation of {Cu2} precursors. In MeOH solution, the reaction of 1 with CF3CO2. resulted in 2, showing a ligand-exchange reaction, leading to different Cu...O separations in the space on the open faces of the cubane structure. Magnetic susceptibility measurements (1.8–350 K) revealed stronger antiferromagnetic interactions in 1, where the average in plane Cu–O–Cu angle is 100.4°, than for 2, having a smaller Cu–O–Cu angle of 97.2°.Read less <
English Keywords
Schiff bases
X-ray diffraction
Jahn–Teller distortion
Carboxylate ligands
Magnetic properties
Origin
Hal imported