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Synthesis, Crystal Structures, Raman and EPR Studies of Mixed Trihalides in Association with Transition Metal (CoII–ZnII) Tris-chelates

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Abstract

Four new isostructural salts, [M(phen)3](I2Br)2·3CH2Cl2 where, M=Co (1), Ni (2), Cu (3), or Zn (4) have been synthesized by reacting the metal nitrates with 1,10–phenanthroline (phen) in presence of potassium bromide and iodine in a two phase procedure. The [Cu(phen)3]2+ coordination corresponds to tetragonally elongated octahedron while the other three are much more symmetrical. The pure Cu2+ complex as well as other salts doped with Cu2+ give hyperfine resolved EPR spectra in a wide temperature range showing dynamic Jahn–Teller distortion. The trihalide ion is nearly linear with bond distances in the range, I–I (2.786–2.833 Å) and I–Br (2.759–2.794 Å). Geometry optimization (DFT and MP2 methods) predicts a much more unsymmetrical “gas phase” structure for I2Br− ion. Calculated Raman frequencies are in reasonable agreement with observed values. Electronic spectral results show that the integrity of the trihalide ion is retained in solution.

Graphical Abstract

Three new isostructural compounds having the general formula [M(phen)3](I2Br)2 having nearly symmetrical I2Br− ion are synthesized and characterized.

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Acknowledgements

R. B. thanks the UGC, New Delhi for a Senior Research Fellowship. G. B. acknowledges support from the UGC in the form of a Women Post Doctoral Fellowship. This work was supported by the UPE-II (UGC), CAS(UGC) and PURSE-II (DST) programs.

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  1. School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India

    Ramavath Babu, G. Bhargavi & M. V. Rajasekharan

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  1. Ramavath Babu
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  2. G. Bhargavi
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  3. M. V. Rajasekharan
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Correspondence to M. V. Rajasekharan.

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Babu, R., Bhargavi, G. & Rajasekharan, M.V. Synthesis, Crystal Structures, Raman and EPR Studies of Mixed Trihalides in Association with Transition Metal (CoII–ZnII) Tris-chelates. J Chem Crystallogr 47, 86–94 (2017). https://doi.org/10.1007/s10870-017-0683-1

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