Interaction of hydrazine with copper(II) chloride in acidic solutions. Formation, spectral and magnetic properties, and structures of copper(II), copper(I), and mixed-valence species

Brown, David B.; Donner, Jeffrey A.; Hall, James W.; Wilson, Scott R.; Wilson, Roxy B.; Hodgson, Derek J.; Hatfield, William E.

doi:10.1021/ic50200a001

Cited by 108 publications

(47 citation statements)

References 10 publications

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“…The first one may to include the m(Cu-Cl terminal ) [37][38][39][40][41][42] and m(Cu-N pyridine ) [38,43,44] vibrations, whereas the second band may comprise the m(Cu-Cl bridge ) [38,39,41,45] and m(Cu-N thiazine ) vibrations [43].…”

Section: Spectroscopic Studiesmentioning

confidence: 99%

Synthesis and physic-chemical properties of a copper(II) complex with 2-(2-pyridyl)iminotetrahydro-1,3-thiazine hydrochloride–water (1/2) (PyTzHCl · 2H 2 O).

Bernalte‐García

García-Barros

Híges-Rolando

et al. 2004

Journal of Inorganic Biochemistry

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Section: Spectroscopic Studiesmentioning

confidence: 99%

Synthesis and physic-chemical properties of a copper(II) complex with 2-(2-pyridyl)iminotetrahydro-1,3-thiazine hydrochloride–water (1/2) (PyTzHCl · 2H 2 O).

Bernalte‐García

García-Barros

Híges-Rolando

et al. 2004

Journal of Inorganic Biochemistry

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“…copper(II) ions in chloride solutions, for which there is evidence in the literature (McConnell and Davidson, 1950;Brown et al, 1979). Reaction (9) is comparable in rate to reactions (7) + (8) and therefore peroxide accumulates in the solution giving rise to enhanced rates at long times and after successive runs in the same solution.…”

Section: Accepted M Manuscriptmentioning

confidence: 98%

The dissolution of chalcopyrite in chloride solutions. IV. The kinetics of the auto-oxidation of copper(I)

Miki¹,

Nicol²

2011

Hydrometallurgy

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The use of chloride in the heap leaching of sulfide minerals requires the regeneration of the oxidants copper(II) and iron(III). While this is possible in a sulfate system by the use of bacterially catalysed oxidation of iron(II), this can only economically be achieved by chemical reaction with dissolved oxygen in chloride systems due to the sensitivity of bacteria to high concentrations of chloride ions.The kinetics of the reduction of dissolved oxygen by copper(I) in acidic chloride solutions has been studied under possible heap leach conditions. The results confirm some published data that the rate is second-order in copper(I). The rate increases with increasing acid concentrations but decreases with increasing chloride and copper(II) concentrations. Peroxide has been shown to be a detectable intermediate and a modified mechanism has been proposed which is consistent with the kinetic data. The use of the derived rate equation in a modified rate expression for the copper-catalysed auto-oxidation of iron(II) has been derived.

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“…In this model, the first term is for an antiferromagnetic Cu II chain 47,48 and the second term is for a dimer of radicals, with their respective coupling constants J 1 and J 2 . The fitting has furnished J 1 = -10.1 cm -1 and J 2 = -186 cm ) and an excellent correlation factor: R = 6.7×10 -6 .…”

Section: (4)mentioning

confidence: 99%

A new molecular magnetic semiconductor based on tetrathiafulvalene (ttf) and oxamato ligand (opba): [ttf]2[Cu(opba)]·H2O

Dias¹,

Stumpf²,

Mambrini³

et al. 2010

J. Braz. Chem. Soc.

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. As propriedades magnéticas (dc) mostram um valor do produto c M T na temperatura ambiente próximo ao esperado para três spins S = ½ desacoplados e um valor de 0.13 emu K mol -1 a baixas temperaturas (4 K). A curva do produto c M T versus T foi ajustada e o melhor modelo consiste de um termo para o dímero (ttf •+ ) 2 (Bleaney-Bowers, resultando em J 2 = -186 cm ).An oxamato-based compound of formula [ttf] 2 [Cu(opba)]·H 2 O, with ttf = tetrathiafulvalene and opba = ortho-phenylenebis(oxamato), has been prepared and characterized. The complex was obtained by metathesis from (ttf) 3 (BF 4 ) 2 and (Bu 4 N) 2 [Cu(opba)] in acetonitrile at room temperature. The UV-Vis-NIR spectrum reveals the presence of the radical cation in two forms, (ttf Keywords: tetrathiafulvalene, molecular magnetism, semiconductor, oxamato ligand, molecular spintronics IntroductionIn the last few decades, the search for a molecular equivalent of a given material has increased, owed to the possibility to incorporate a new property through organic or coordination compounds maintaining the features of the original system. In the area of electronic materials, for example, molecular conductors constitute a theme of large appeal, where ttf (tetrathiafulvalene, 2,2'-bi-1,3-dithiole) and its derivatives are by far the most investigated. Ttf is a π-electron donor capable to form radical [ttf 2 In Dias et al. 1275 Vol. 21, No. 7, 2010 1973, the first 1D metal [ttf-tcnq] (with tcnq = tetra-cyanop-quinodimethane) was described.3 Its structure consists of stacks of either the tcnq or ttf planar molecules and there is a partial electron transfer from the donor to the acceptor forming the charge-transfer salt [ttf] δ+ [tcnq] containing organic radicals and paramagnetic coordination compounds are found in the literature. The stacking of multilayers is the topological feature of the devices that already use the GMR or MTJ technologies with magnetic control of the flow of spin-polarized electrons. Indeed, a molecular construction of each thin layer with specific properties, promoting tailored interlayer interactions or maintaining isolation through organic or inorganic spacers represents a significant challenge to synthetic chemists.Our group has worked with several planar building blocks and organic radicals that show the capability to form 2D networks, negatively or positively charged, which are candidates to contribute to the development of a molecular branch of spintronics. Recently, a magnetic molecular semiconductor based on a dithiolene ligand derivative and the nitronyl nitroxide radical cation was presented. 24Herein we report the synthesis and properties of the first molecular semiconductor with the tetrathiafulvalene cation and a paramagnetic oxamato-based complex of formula Experimental Physical measurementsInfrared spectra were obtained by using a Fourier transform infrared spectrometer Galaxy 3030 model (Mattson Instrument) with DTGS (deuterated triglycine sulphate) detector on KBr pellets. The UV-Vis-NIR absorption spectra were mea...

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Interaction of hydrazine with copper(II) chloride in acidic solutions. Formation, spectral and magnetic properties, and structures of copper(II), copper(I), and mixed-valence species

Cited by 108 publications

References 10 publications

Synthesis and physic-chemical properties of a copper(II) complex with 2-(2-pyridyl)iminotetrahydro-1,3-thiazine hydrochloride–water (1/2) (PyTzHCl · 2H 2 O).

Synthesis and physic-chemical properties of a copper(II) complex with 2-(2-pyridyl)iminotetrahydro-1,3-thiazine hydrochloride–water (1/2) (PyTzHCl · 2H 2 O).

The dissolution of chalcopyrite in chloride solutions. IV. The kinetics of the auto-oxidation of copper(I)

A new molecular magnetic semiconductor based on tetrathiafulvalene (ttf) and oxamato ligand (opba): [ttf]2[Cu(opba)]·H2O

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