Universität zu Köln

Wackerbarth, Ines, Widhyadnyani, Ni Nyoman Agnes Tri, Schmitz, Simon, Stirnat, Kathrin, Butsch, Katharina, Pantenburg, Ingo, Meyer, Gerd and Klein, Axel ORCID: 0000-0003-0093-9619 (2020). Cu-II Complexes and Coordination Polymers with Pyridine or Pyrazine Amides and Amino Benzamides-Structures and EPR Patterns. Inorganics, 8 (12). BASEL: MDPI. ISSN 2304-6740

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Abstract

Isonicotine amide, picoline amide, pyrazine 2-amide, 2- and 4-amino benzamides and various Cu-II salts were used to target Cu-II complexes of these ligands alongside with 1D and 2D coordination polymers. Under the criterion of obtaining crystalline and single phased materials a number of new compounds were reliably reproduced. Remarkably, for some of these compounds the ideal Cu:ligand ratio of the starting materials turned out to be very different from Cu:ligand ratio in the products. Crystal and molecular structures from single-crystal XRD were obtained for all new compounds; phase purity was checked using powder XRD. We observed exclusively the O-amide and not the NH2amide function binding to Cu-II. In most of the cases; this occurred in chelates with the second pyridine, pyrazine or aminophenyl N function. mu-O,N ditopic bridging was frequently observed for the N = pyridine, pyrazine or aminophenyl functions, but not exclusively. The geometry around Cu-II in these compounds was very often axially elongated octahedral or square pyramidal. X-band EPR spectra of powder samples revealed various spectral symmetry patterns ranging from axial over rhombic to inverse axial. Although the EPR spectra cannot be unequivocally correlated to the observed geometry of Cu-II in the solid state structures, the EPR patterns can help to support assumed structures as shown for the compound [Cu(Ina)(2)Br-2] (Ina = isonicotine amide). As UV-vis absorption spectroscopy and magnetic measurement in the solid can also be roughly correlated to the surrounding of Cu-II, we suggest the combination of EPR, UV-vis spectroscopy and magnetic measurements to elucidate possible structures of Cu-II compounds with such ligands.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wackerbarth, Ines UNSPECIFIED UNSPECIFIED UNSPECIFIED Widhyadnyani, Ni Nyoman Agnes Tri UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmitz, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Stirnat, Kathrin UNSPECIFIED UNSPECIFIED UNSPECIFIED Butsch, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Pantenburg, Ingo UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, Gerd UNSPECIFIED UNSPECIFIED UNSPECIFIED Klein, Axel UNSPECIFIED orcid.org/0000-0003-0093-9619 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-309431
DOI:	10.3390/inorganics8120065
Journal or Publication Title:	Inorganics
Volume:	8
Number:	12
Date:	2020
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2304-6740
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RAY CRYSTAL-STRUCTURE; COPPER(II) COMPLEXES; X-RAY; SPECTROSCOPIC CHARACTERIZATION; MAGNETIC-PROPERTIES; BRIDGING LIGANDS; ISONICOTINAMIDE; HALIDE; AZIDE; ANION Multiple languages Chemistry, Inorganic & Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/30943