Novel Supramolecular Assemblies of Co(III) & Cu(II) with Diethylenetriamine and Azide: Synthesis, Structure, Spectroscopic and Magnetic Studies

Priyanka Pandey, Goulven Cosquer, Masahiro Yamashita, Sailaja S. Sunkari

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In exploring the role of increased ligand basicity as well as denticity on moving from ethylenediamine (en) or 1,3-diaminopropane (1,3-dap), on supramolecular solid formation, complexation involving diethylenetriamine (det) and azide with CoII and CuII afforded three new complexes [Co(det)2](N3)3 (1), [Co(det)(N3)3] (2) and [Cu2(det)2(N3)5(H2O)2Na] (3) under self assembling conditions and are characterized structurally and magnetically. Formation of 1 and 2 is sensitive to temperature of crystallization, while such a temperature influence could not be observed for CuII system due to lack of crystals at low temperatures. As expected with a tridentate ligand, strong chelation stabilizes 1 at LT and is a thermodynamically stable product, while isolation of 2 at RT conditions is under kinetic control. Decomposition of 2 at high temperatures (above 70 °C) as revealed through temperature dependent UV-vis spectral studies also confirms its instability. Presence of three donor sites of det, leads to interesting structural pattern in Jahn-Teller active CuII, resulting in cationic chains of [Cu(det)(N3)]n + bridged by μ-1,3 azido bridges to the neighboring [Na(H2O)2(N3)2] units, thus leading to a 2-D assembly of alternating layers of cationic and anionic chains in the unit cell of 3. Magnetic studies of 3 reveals anti-ferromagnetic interaction between the copper ions (J=– 0.479 cm–1), in conformity with the bridge angle dependent magnetic behavior in azido bridged copper complexes.

Original languageEnglish
Pages (from-to)2240-2244
Number of pages5
JournalChemistrySelect
Volume3
Issue number8
DOIs
Publication statusPublished - 2018 Feb 28

Keywords

  • Azide
  • Cobalt (III)
  • Copper(II)
  • Diethylenetriamine
  • Magnetic study

ASJC Scopus subject areas

  • Chemistry(all)

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