Covalent bonding in NH4Br:Cu2+

Mauro, Eduardo Di; Domiciano, S. M.

doi:10.1016/s0022-3697(99)00198-5

Cited by 33 publications

(5 citation statements)

References 26 publications

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“…From the order of g J 4 g > 4 g e (free electron g value, g e = 2.0023), it can be concluded that Cu2 II ions are located in tetragonal distorted octahedral sites (D 4h ) elongated along the z-axis and the ground state of the paramagnetic electron is d x 2 Ày 2 ( 2 B 1g state). [37][38][39][40] The result obtained from EPR is confirmed by the single crystal analysis data for C2 (Table 2). On the other hand, due to that the surroundings of Cu1 II is disordered triangular bipyramid (Fig.…”

Section: Epr and Magnetic Susceptibility Studiessupporting

confidence: 67%

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange

et al. 2014

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Section: Epr and Magnetic Susceptibility Studiessupporting

confidence: 67%

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange

et al. 2014

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“…22 The g values of copper for both complexes are on the order of g ∥ > g ⊥ > g e (free electron g value, g e = 2.0023), which implies that the d x 2 −y 2 orbital is occupied by an unpaired electron. 23 No hyperfine splittings could be observed for either Pcs in the powder samples. For both cases, g ∥ > g ⊥ , which indicates a planar anisotropy where the copper is within the plane of the four inner nitrogen atoms of the Pc.…”

Section: Resultsmentioning

confidence: 86%

“…The measured components of the g factors indicate that the paramagnetic copper center in both Pcs is axially symmetric, with g z = g ∥ and g x = g y = g ⊥ . The g values of copper for both complexes are on the order of g ∥ > g ⊥ > g e (free electron g value, g e = 2.0023), which implies that the d x 2 – y 2 orbital is occupied by an unpaired electron . No hyperfine splittings could be observed for either Pcs in the powder samples.…”

Section: Resultsmentioning

confidence: 93%

Effect of the Substitution Pattern (Peripheral vs Non-Peripheral) on the Spectroscopic, Electrochemical, and Magnetic Properties of Octahexylsulfanyl Copper Phthalocyanines

et al. 2018

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In order to investigate the substitution position effect on the spectroscopic, electrochemical, and magnetic properties of copper phthalocyanines, a detailed structure-property analysis has been performed by examining two copper phthalocyanines that are octasubstituted by hexylsulfanyl chains respectively in the peripheral (Cu-P) and non-peripheral (Cu-NP) positions. Cu-NP showed a marked near-IR maximum absorption compared to Cu-P and, accordingly, a smaller HOMO-LUMO energy gap, calculated via the electrochemical results and simulations in the gas phase, as well as for Cu-NP from its crystallographic data. An electron-spin resonance (ESR) technique is used to extract the g values from the powder spectra that are taken at room temperature. The g values were determined to be g = 2.160 and g = 2.045 for Cu-P and g = 2.150 and g = 2.050 for Cu-NP. These values indicate that the paramagnetic copper center in both phthalocyanines has axial symmetry with a planar anisotropy ( g > g). The ESR spectra in solution could be obtained only for Cu-P. Curie law is used to fit the experimental data of the magnetic susceptibility versus temperature graphs, and the Curie constant ( C) and diamagnetic/temperature-independent paramagnetic (α) contributions are deduced as 0.37598 (0.39576) cm·K/mol and -23 × 10 (25 × 10) cm/mol respectively for Cu-P and Cu-NP. The room temperature magnetic moment value (1.70 μ) is close to the spin-only value (1.73 μ) for the peripheral complex, showing that there is no orbital contribution to μ. In contrast, at room temperature, the value of the magnetic moment (1.77 μ) is above the spin-only value, showing an orbital contribution to the magnetic moment. Cu-NP's room temperature magnetic moment value is larger than the value for Cu-P, demonstrating that the orbital contribution to the magnetic moment depends upon the substituent position. The magnitudes of the effective magnetic moment values also support that both Cu-P and Cu-NP complexes have square-planar coordination. This result is consistent with the determined g values. The spin densities were determined experimentally, and the results suggest that the positions of the substituents affect these values (0.469 for Cu-P and 0.490 for Cu-NP).

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“…This spectrum belongs to Cu 2+ ion (S = 1/2, I = 3/2). It can be inferred from the order of g // > g ⊥ > g e (g e = 2.0023, free electron g value) that, Cu 2+ is located in distorted items (D 4h ) elongated along the ground state of the paramagnetic electron is d x 2 −y 2 ( 2 B 1g state) and z-axis [61][62][63][64] . The magnetic susceptibilities of 1 and 2 were recorded in the temperature of 10-300 K. The temperature dependence of magnetic (χ m ) and χ m T are seen in Figures S10 and S11 (Supplementary Material) for both complexes.…”

Section: Resultsmentioning

confidence: 99%

Metalo components exhibiting significant anticancer and antibacterial properties: a novel sandwich-type like polymeric structure

Karadağ

Korkmaz

Aydın

et al. 2020

Sci Rep

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Four new dicyanoargentate(I)-based complexes 1-4 were synthesized from certain metal ions with a tetradentate ligand [N, N-bis (2-hydroxyethyl)-ethylenediamine; N-bishydeten] and determined by diverse procedures (elemental, thermal, FT-IR, ESI-MS for 1-3 and, magnetic susceptibility and EPR for 1, and 2) including crystal analysis of 4. The crystal method revealed that complex 4 has a sandwich-type like polymeric chemical structure with layers formed by [Cd(N-bishydeten) 2 ] 2+ cations and [Ag(CN) 2 ] − anions. The complexes were further characterized by fluorescence and UV spectroscopy to determine their physicochemical features. The complexes displayed a DNA binding activity within the same range as found for cisplatin, in addition to their strong stability in the presence of the physiological buffer system. The complexes were also investigated for pharmacological properties like interaction with DNA/Bovine serum albumin, anticancer and antibacterial activities. Physicochemical studies of DNA with the complexes suggested that the interaction mode between them are possibly both intercalative and groove binding types. These spectroscopic measurements also show that there may be a binding tendency between BSA and the complexes via hydrogen or Van der Waals bonds. The viability tests demonstrated that all the complexes exhibited antibacterial (1-4) and anticancer effects (2-4) toward ten diverse bacterial strains and three tumor cells (HT-29 colon adenocarcinoma, HeLa cervical cancer, and C6 glioma), respectively. Despite the current advances in cancer therapy, the death rate from cancer and therapeutic agents are still increasing 1. A significant number of studies have focused on the synthesis and design of a new antiproliferative agent to reduce the risk of drug resistance and cell toxicity 2-4. Some of these studies are related to metallo compounds which constitute a significant part of agents with potent pharmacological activities, and their medicinal availability has been still explored 5,6. For example, some macrocyclic polyamines containing Ni, Cu, and Ru could recognize TAR RNA molecules and cleave them, and affect the interaction of Tat-RNA 7. Mn(II) complex of 2H-5-hydroxy-1,2,5-oxadiazo[3,4-f]1,10-phenanthroline has significant antitumor activity against HL-60, KB, Hela and BGC-823 cells.

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Covalent bonding in NH4Br:Cu2+

Cited by 33 publications

References 26 publications

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange

Effect of the Substitution Pattern (Peripheral vs Non-Peripheral) on the Spectroscopic, Electrochemical, and Magnetic Properties of Octahexylsulfanyl Copper Phthalocyanines

Metalo components exhibiting significant anticancer and antibacterial properties: a novel sandwich-type like polymeric structure

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Covalent bonding in NH4Br:Cu2+

Cited by 33 publications

References 26 publications

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)6]3− building blocks: crystal structure of [Cu2(N-bishydeten)2Co(CN)6]·3H2O having a strong antiferromagnetic exchange

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)6]3− building blocks: crystal structure of [Cu2(N-bishydeten)2Co(CN)6]·3H2O having a strong antiferromagnetic exchange

Effect of the Substitution Pattern (Peripheral vs Non-Peripheral) on the Spectroscopic, Electrochemical, and Magnetic Properties of Octahexylsulfanyl Copper Phthalocyanines

Metalo components exhibiting significant anticancer and antibacterial properties: a novel sandwich-type like polymeric structure

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Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange

Synthesis and characterization of new heterometallic cyanido complexes based on [Co(CN)₆]³⁻ building blocks: crystal structure of [Cu₂(N-bishydeten)₂Co(CN)₆]·3H₂O having a strong antiferromagnetic exchange