Ple aDs ea l dt oo nn To rt a and sj ua sc tt imo na sr gins
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Mn-O-Mn angle and complexes remain ferromagnetic upto much
wider angle.
References
DOI: 10.1039/C5DT01224D
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In summary, both the structural parameters viz. Mn-O distance and
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3
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distances, then the Mn-O-Mn angle is the dominating structural
parameter to make an effective change of J values. In our
complexes, Mn-O distance varies from 2.337-2.418 Å, which is too
small to make an effective change of J values. Therefore, it is
obvious that the Mn-O-Mn angle has more control on modulating J
values for our cases and also in the complexes reported by Bhargavi
2
.
9,10
and Mandal et al.
Conclusions
3
.
a) P. Kar, R. Biswas, M. G. B. Drew, Y. Ida, T. Ishida and A.
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Three new phenoxido bridged Mn(III) complexes derived from a
salen type Schiff base ligand have been synthesized and
characterized in order to study the magneto-structural correlations.
Complexes 1 and 2 are di-phenoxido bridged centrosymmetric
dimers whereas, 3 consists of alternating phenoxido and 1,5
dicyanamido bridges, resulting in a 1D chain. We have determined
J values of these complexes experimentally and corroborate it by
means of DFT calculations. From the experimental and theoretical
results of the present complexes and previously reported
complexes, we show that J value does not solely depend on longer
Mn-O distance but also on Mn-O-Mn angle. From DFT studies it
has been verified that there is a linear dependence of J value on
Mn-O-Mn angle and with increase in the angle J value decreases. In
the complexes having relatively small Mn-O distance, Mn-O-Mn
angle is the dominating structural parameter for interpreting the
magnetic interaction specially when the variation of Mn-O distance
is restricted within a short range as in the present complexes.
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Acknowledgements
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2
We thank the DST-FIST of India funded Single Crystal
Diffractometer Facility at the Department of Chemistry, University
of Calcutta, Kolkata, India. We also thank CRNN, University of
Calcutta, Kolkata, India for magnetic measurement. The authors
thank the Department of Science and Technology (DST), New
Delhi, India, for financial support (SR/S1/IC/0034/2012). P.S. and
S.G are grateful to the UGC, Government of India for a research
fellowship (UGC/52/Jr. Fellow (Enhancement) and Dr. D S Kothari
fellowship (F.4-2/2006(BSR)/CH/13-14/0069) respectively.
2. SAINT, version 6.02, SADABS, version 2.03, Bruker AXS,
Inc., Madison, WI, 2002.
3. G. M. Sheldrick, SHELXS-97, Program for solution of crystal
structures, University of Göttingen, Germany, 1997.
4. G. M. Sheldrick, SHELXL-97, Program for refinement of
crystal structures, University of Göttingen, Germany, 1997.
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