Covalent and ionic Cu(II) complexes with cyclam and substituted benzoato ligands: structural, thermal, redox and mesomorphic properties

Abdullah, Norbani; Arifin, Zaenal; Tiekink, Edward R. T.; Sharmin, Naima; Tajidi, Nur Syamimi Ahmad; Hussin, Siti Amira Mat

doi:10.1080/00958972.2016.1147032

Cited by 7 publications

(3 citation statements)

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“…In the visible part of the spectra of complexes Cu(II) with cyclam and various carboxylate ligands with octahedral geometry, one maximum is observed for d-d transitions at a wavelength of 505 to 546 nm. 17,19 These spectral features are consistent with six coordinate geometry for Cu(II) complexes. Besides octahedral geometry Cu(II) complexes of square pyramid or distorted square pyramid geometries exhibit a band in the 550-660 nm range, whereas the corresponding trigonal bipyramidal complexes usually show a maximum at λmax 800 nm with a higher energy shoulder.…”

Section: Accepted Manuscriptsupporting

confidence: 58%

“…The complex is stable up to 310 °C which may indicate that the water present in the complex is coordinated for Cu (II) or that it participates in the strong hydrogen bonds. 17 DTA curve of this complex reveals that decomposes at one step showing exothermic peak at 310 °C.…”

Section: Thermal Analysismentioning

confidence: 98%

“…The values for A (1.98 BM) and B (2.15 BM) in agreement with the values reported for several Cu(II) octahedral complexes (1.9+-2.2 BM). 17 Spectral studies UV-visible spectroscopy: The absorption spectra in the UV and visible regions were recorded for new complexes in CH3CN solutions. Both complexes are pink.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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New copper(II) cyclam complexes with aminocarboxylate co-ligands: Synthesis, characterization, and in vitro antiproliferative and antibacterial studies

Dražić

Antonijević-Nikolić

Marinović‐Cincović

et al. 2022

JSCS

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Two new cationic Cu(II) complexes of cyclam (1,4,8,11-tetraazacyclo-tetradecane) and aminocarboxylate coligands glycine or alanine have been synthesized. The complexes were characterized by elemental analysis (C, H, and N), molar electrical conductivity, magnetic susceptibility measurement at room temperature, spectral methods (UV/vis and FTIR), as well as TG and DTA. The analytical data of the complexes show the formation of mononuclear complexes with general formula [Cu(L)cyc](ClO4)2?nH2O, (A): L = glycine, n = 1.5 and (B): L = alanine, n = 2.5. The tetradentate ligand cyclam was coordinated to metals through four N donors. The spectroscopic data suggested that the amino carboxylate ligands coordinated via their carboxylate ion moieties. The six-coordinate octahedral geometry around Cu(II) in both complexes was proposed. TG-DTA analysis indicates that complex B decomposes exothermally in a single step in the range of 310 -400 ?C . The cytotoxic activity of Cu(II) complexes and the starting ligands were tested against human cervix adenocarcinoma cell line (HeLa), human melanoma (FemX) and human colon carcinoma (LS174). The IC50 values for the Cu(II) complexes were from 48.35-82.25 ?M. Both complexes were tested for their antimicrobial activity against Staphylococcus aureus, Bacillus subtilis, Escherichia coli and the yeast Candida albicans.

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Section: Accepted Manuscriptsupporting

confidence: 58%

Section: Thermal Analysismentioning

confidence: 98%