Polymorphism in [Co(SCN)4(ppz-H)2] (ppz,piperazine) |
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| Authors: | Subal Chandra Manna Atish Dipankar Jana Michael G.B. Drew Golam Mostafa Nirmalendu Ray Chaudhuri |
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| Affiliation: | 1. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India;2. Department of Physics, Jadavpur University, Kolkata 700 032, India;3. Department of Chemistry, The University of Reading, Whiteknights, Reading RG6 6AD, UK |
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| Abstract: | A one-pot reaction of [Co(NO3)2 · 6H2O and piperazine] with NH4SCN/NaSCN in water–methanol (1:1) solvent leads to two polymorphs of [Co(SCN)4(ppz-H)2] (ppz, piperazine) (I and II). X-ray crystal structure reveals both have same space group but the differences in the alignment of pendant SCN− leads to two polymorphs. In I, trifurcated N–H?S hydrogen bonding plays a prominent role in crystal packing leading to S?S interactions between SCN fragments but in II, no such trifurcation arises and thereby the crystal packing occurs through hydrogen bonding interactions only leading to a distinctly different network topology. TG/DSC and FT-IR study reveal they are enantiotropically related. |
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| Keywords: | Co(II) SCN&minus Piperazine Polymorphism |
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