Journal
MOLECULES
Volume 25, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/molecules25153376
Keywords
copper; crystal structure; isothiocyanate; azide; dicyanamide; five-coordinated; UV-vis spectra
Funding
- department of chemistry at UL Lafayette
- Graz University of Technology
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A novel series of mononuclear five-coordinated pseudohalido-Cu(II) complexes displaying distorted square bipyramidal: [Cu(L-1)(NCS)(2)] (1), [Cu(L-2)(NCS)(2)] (2) and [Cu(L-3)(NCS)]ClO4(5) as well as distorted trigonal bipyramidal: [Cu(isp(3)tren)(N-3)]ClO4(3), [Cu(isp(3)tren)(dca)]ClO4(4) and [Cu(tedmpza)(dca)]ClO4 center dot 0.67H(2)O (6) geometries had been synthesized and structurally characterized using X-ray single crystal crystallography, elemental microanalysis, IR and UV-vis spectroscopy, and molar conductivity measurements. DifferentN-donor amine skeletons including tridentate: L-1= [(2-pyridyl)-2-ethyl)-(3,4-dimethoxy)-2-methylpyridyl]methylamine and L-2= [(2-pyridyl)-2-ethyl)-(3,5-dimethyl-4-methoxy)-2-methyl-pyridyl]methylamine, and tetradentate: L-3= bis(2-ethyl-di(3,5-dimethyl-1H-pyrazol-1-yl)-[2-(3,4-dimethoxy-pyridylmethyl)]amine, tedmpza = tris[(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]amine and isp(3)tren = tris[(2-isopropylamino)ethyl)]amine ligands were employed. Molecular structural parameters such as nature of coligand, its chelate ring size and steric environment incorporated into its skeleton, which lead to adopting one of the two limiting geometries in these complexes and other reported compounds are analyzed and correlated to their assigned geometries in solutions. Similar analysis were extended to other five-coordinated halido-Cu(II) complexes.
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