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Articles

Coumarin-naphthohydrazone ligand with a rare coordination mode to form Mn(II) and Co(II) 1-D coordination polymers: synthesis, characterization, and crystal structure

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Pages 1127-1146 | Received 07 Jul 2017, Accepted 18 Jan 2018, Published online: 13 Mar 2018
 

Abstract

The hydrazone (E)-3-hydroxy-N’-(1-(2-oxo-2H-chromen-3-yl)ethylidene)-2-naphthohydrazide (H2L) was synthesized from the reaction of 3-acetylcoumarin and 3-hydroxy-2-naphthoic hydrazide in methanol. Compounds [Mn(H2L)(NO3)2(CH3OH)]·CH3OH (1a), [Mn(HL)(NO3)(CH3OH)]n (1b), [Co(HL)(NO3)(CH3OH)]n (2), and [Cu(HL)(NO3)] (3) were obtained by reaction of an equimolar amount of H2L with nitrate salts of Mn(II), Co(II), or Cu(II) in methanol. The reaction of ligand and Mn(NO3)2·4H2O was also carried out in the presence of sodium azide which led to the 1-D coordination polymer, [Mn(HL)(N3)(CH3OH)]n (4). All of the synthesized compounds were characterized by elemental analyses and spectroscopic methods. Single-crystal X-ray analysis of 1–4 indicated that H2L is neutral (in 1a) or mononegative ligand (in 1b, 2, 3 and 4). In 1b, 2 and 4 the 1-D polymeric chain is found by a rare coordination mode of this kind of hydrazone ligand since the naphtholic oxygen is coordinated to the neighboring metal ions while the NH moiety of hydrazone remains intact, also confirmed by FT-IR spectroscopic studies. The thermal stability of 2 and 4 were also studied from 30–1000 °C.

Acknowledgements

The authors are grateful to Imam Khomeini International University, the University of Zanjan and Dokuz Eylül University for support of this study. M. Aygün acknowledges Dokuz Eylül University for the use of the Oxford Rigaku Xcalibur Eos Diffractometer (purchased under University Research [grant number 2010.KB.FEN.13].

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