First copper(II)-cyclophosphato complex with macrocyclic N-donor ligand: Single crystal structure elucidation with Hirshfeld surface analysis, optical, electrochemical and antioxidant properties
Abstract
From the system metal-cyclam-condensed phosphate is isolated the first complex of {(H3O+)2[Cu(II)(μ-P4O12)(cyclam)]}n(1). This complex was characterized by X-ray diffraction (XRD), spectroscopy (diffuse reflectance, UV-Vis and FT-IR) and thermal analysis (DTA/TGA). The solved molecular structure of 1 revealed one rare 1D-anionic polymeric copper(II)-complex, {[Cu(II)(μ-P4O12)(cyclam)]2-}n, involving two distinct ring ligands (cyclam / cyclotetraphosphate), in which a new coordination mode of the P4 O124- was observed. The counterions (H3O+) ensure the connection between 1D-polymers by acting as donor in a strong "charge-assisted" hydrogen bonds with P4O12 rings leading to 2D-supramolecular frameworks arranged in -A-B-A- fashion. The 2D-supramolecular network is stabilized by O/N-H…O interactions whereas the van der Waals contacts play a key role in the consolidation of the 3D packing as verified by Hirshfeld surface analysis in combination with 2D fingerprint plots. The biochemical properties of 1 was also evaluated via DDPH, ABTS, hydroxyl radical scavengers and ferric reducing power (FRP) showing promising antioxidant activities which has been clarified by means of the cyclic voltammetric study.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- July 2018
- DOI:
- 10.1016/j.jssc.2018.04.004
- Bibcode:
- 2018JSSCh.263....1H
- Keywords:
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- Cyclotetraphosphate;
- Cyclam;
- 1D-polymeric complex;
- Optical properties;
- Antioxidant activities