Journal
POLYHEDRON
Volume 98, Issue -, Pages 224-229Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2015.06.016
Keywords
Coordination network; Luminescence; Mechanical grinding; Hydrogen bonding; 3-(4-Pyridyl)benzoate
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Funding
- South African National Research Foundation (NRF)
- University of Cape Town Chemistry Equity Development Programme
- UCT NRF Innovation International Doctoral Scholarship
- UCT JW Jagger Centenary Gift Scholarship
- International Centre for Diffraction Data (ICDD): Ludo Frevel Crystallography Scholarship Award
- UCT Research office through the UCT programme for the Enhancement of Research Capacity (PERC)
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A 3D hydrogen-bonded Co(II) complex (Co(34pbz)(2)center dot(H2O)(4)}(n) (1), where 34pbz is 3-(4-pyridyl)benzoate, is found to exhibit thermo- and mechanochromic behaviour. The thermochromic behaviour in the temperature range of 30-120 degrees C may be attributed to the disruption of the supramolecular environments or metal to ligand charge transfer transitions. Above 150 degrees C this behaviour is attributed to loss of coordinated water molecules from the Co(II) which has the effect of altering the visible d-d electronic transitions. Interestingly, when crystals of 1 are ground, a purple colour is observed under ambient light. This mechanochromic property is ascribed to change in the crystal field around the Co(II) centre. These effects are fully reversible as suggested by PXRD and thermal analysis studies. (C) 2015 Elsevier Ltd. All rights reserved.
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