Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI=Na+, K+, NH4+)

Palacios, Daniel; Wladimirsky, Alejandra; D’Antonio, María C.; González‐Baró, Ana C.; Baran, Enrique J.

doi:10.1016/j.saa.2011.04.034

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…Bond Valence Sum (BVS) calculation reveals the valence for Cu and Na is +2.118 and +1.016, respectively. These values agree well with other similar compounds …”

Section: Resultssupporting

confidence: 92%

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A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

Yao

Armstrong

Lightfoot

2016

Zeitschrift anorg allge chemie

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“…Bond Valence Sum (BVS) calculation reveals the valence for Cu and Na is +2.118 and +1.016, respectively. These values agree well with other similar compounds …”

Section: Resultssupporting

confidence: 92%

“…In the sodium‐copper‐oxalate system, only one phase has been reported so far, viz. Na 2 Cu(C 2 O 4 ) 2 · 2H 2 O …”

Section: Introductionmentioning

confidence: 99%

A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

Yao

Armstrong

Lightfoot

2016

Zeitschrift anorg allge chemie

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“…The frequencies of the absorption bands in the 1700-1200 cm À1 region are assigned to the stretching and deformation vibration modes (symmetric and asymmetric) of the carboxylate groups within the coordinated ligand. Moreover, the frequency values observed tell us about the coordination mode of the oxalate ligand when acting as chelating or bridging two or more metal atoms, as has been reported in earlier studies for related compounds (Vlad et al, 2008;Kherfi et al, 2010;Palacios et al, 2011). The oxalate ligand bonded to the metal atoms is shown by the presence of weaker bands near 550-400 cm À1 due to (M-O) stretching (M = Li or Na, and Cr) combined with ring deformation (Onggo et al, 2008;Jacewicz et al, 2012;Kherfi, 2014;Benhacine et al, 2016).…”

Section: Tablesupporting

confidence: 71%

ACr(C₂O₄)₂(H₂O)₄(A= Li or Na): two new coordination polymers of low dimensionality with different hydrogen-bond networks

et al. 2019

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Single crystals of two new bimetallic oxalate compounds with the formula [ACr(C 2 O 4 ) 2 (H 2 O) 4 ] n (A = Li or Na), namely catena-poly [[diaqualithium(I)], (II), have been synthesized, characterized and their crystal structures elucidated by X-ray diffraction analysis and compared. The compounds crystallize in the monoclinic space group C2/m for (I) and in the triclinic space group P1 for (II); however, they have somewhat similar features. In the asymmetric unit of (I), the Li and Cr atoms both have space-group-imposed 2/m site symmetry, while only half of the oxalate ligand is present and two independent water molecules lie on the mirror plane. The water O atoms around the Li atom are disordered over two equivalent positions separated by 0.54 (4) Å . In the asymmetric unit of (II), the atoms of one C 2 O 4 2À ligand and two independent water molecules are in general positions, and the Na and Cr atoms lie on an inversion centre. Taking into account the symmetry sites of both metallic elements, the unit cells may be described as pseudo-facecentred monoclinic for (I) and as pseudo-centred triclinic for (II). Both crystal structures are comprised of one-dimensional chains of alternating trans-Cr(CO) 4 (H 2 O) 2 and trans-A(CO) 4 (H 2 O) 2 units 2 -bridged by bis-chelating oxalate ligands. The resulting linear chains are parallel to the [101] direction for (I) and to the [111] direction for (II). Within the two coordination polymers, strong hydrogen bonds result in tetrameric R 4 4 (12) synthons which link the metal chains, thus leading to two-dimensaional supramolecular architectures. The two structures differ from each other with respect to the symmetry relations inside the ligand, the role of electrostatic forces in the crystal structure and the molecular interactions of the hydrogen-bonded networks. Moreover, they exhibit the same UV-Vis pattern typical of a Cr III centrosymmetric geometry, while the IR absorption shows some differences due to the oxalate-ligand conformation. Polymers (I) and (II) are also distinguished by a different behaviours during the decomposition process, the precursor (I) leading to the oxide LiCrO 2 , while the residues of (II) consist of a mixture of sodium carbonate and Cr III oxide.

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“…[ 33,34 ] However, the spectral features of the oxalate group can be distinguished, and a general behavior closely follows the Raman spectrum of another Cu oxalate, wheatleyite Na 2 Cu(C 2 O 4 ) 2 ·2H 2 O. [ 35,36 ] The bands of COO antisymmetric stretching vibrations are found in the 1600–1700 cm −1 range, with five bands at 1658, 1672, 1688, 1701, and 1709 cm −1 . The origin of the band at 1763 cm −1 is unclear.…”

Section: Resultsmentioning

confidence: 91%

Raman study of several Cu‐bearing complex minerals from the guano deposit at Pabellón de Pica, Tarapaca region, Chile

Košek

Němec

Jehlička

2023

J Raman Spectroscopy

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Pabellón de Pica, Tarapaca, Chile, is a former guano mine exploited in the late 19th and early 20th centuries. Guano is in a direct contact with Cu sulfide mineralization leading to the formation of minerals with a highly unusual chemical composition, especially Cu‐organic complexes and nitrogen‐bearing phases. In this work, we report results of the Raman spectroscopic investigation of several unique Cu‐bearing minerals that are the result of supergene processes at the Pabellón da Pica site. We focus on several minerals with new and interesting structure types which were described from this locality for the first time, namely, antipinite (K–Na–Cu oxalate), ammineite (Cu ammine complex), chanabayaite (Cu ammine triazolate complex), and joanneumite (Cu isocyanurate). The Raman spectra contain specific bands attributed to the characteristic vibrations of the molecular groups present in the minerals (oxalate, ammine, triazolate, and isocyanurate groups) and vibrations within Cu‐centered polyhedra. A comparison was made with the vibrational spectra of related minerals and synthetic phases, which revealed substantial proliferation and shifting of numerous bands, which is in agreement with the complex composition of the investigated minerals. The results obtained appropriately complement known structural and spectroscopic data published previously.

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Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI=Na+, K+, NH4+)

Cited by 13 publications

References 18 publications

A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

ACr(C₂O₄)₂(H₂O)₄(A= Li or Na): two new coordination polymers of low dimensionality with different hydrogen-bond networks

Raman study of several Cu‐bearing complex minerals from the guano deposit at Pabellón de Pica, Tarapaca region, Chile

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Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI=Na+, K+, NH4+)

Cited by 13 publications

References 18 publications

A Novel Copper Oxalate, Na2Cu(C2O4)2

A Novel Copper Oxalate, Na2Cu(C2O4)2

ACr(C2O4)2(H2O)4(A= Li or Na): two new coordination polymers of low dimensionality with different hydrogen-bond networks

Raman study of several Cu‐bearing complex minerals from the guano deposit at Pabellón de Pica, Tarapaca region, Chile

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Product

Resources

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A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

A Novel Copper Oxalate, Na₂Cu(C₂O₄)₂

ACr(C₂O₄)₂(H₂O)₄(A= Li or Na): two new coordination polymers of low dimensionality with different hydrogen-bond networks