Crystal structure and spectroscopic analysis of a new oxalate-bridged MnIIcompound:catena-poly[guanidinium [[aquachloridomanganese(II)]-μ2-oxalato-κ4O1,O2:O1′,O2′] monohydrate]

Sehimi, Hiba; Chérif, Ichraf; Zid, Mohamed Faouzi

doi:10.1107/s2056989016006605

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…The molecular structure and atom labelling of (I), with displacement ellipsoids drawn at the 50% probability level. agreement with the data from the crystal structure analyses of known guanidinium salts (Hammerl et al, 2005;Tiritiris & Kantlehner, 2015;Sehimi et al, 2016;Buvaylo et al, 2017). Protonation in the cation of (I) occurs exclusively at the imino N atoms.…”

Section: Figuresupporting

confidence: 87%

“…The guanidine fragments (N1/N2/N3/C4) are planar [maximum deviation = 0.010 (1) Å for atom C4], with their planes twisted by approximately 77.64 (5) with respect to each other. The C-N bond lengths fall in the range 1.3169 (11)-1.3592 (10) Å (Table 4) and are close to the analogous bonds in the cation of (I) and other aminoguanidine derivatives (Hammerl et al, 2005;Tiritiris & Kantlehner, 2015;Sehimi et al, 2016;Buvaylo et al, 2017). The twisted conformation of the cation of (II) and the charge delocalization in its CN 3 planes appear to result from the double protonation.…”

Section: Figuresupporting

confidence: 56%

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Formaldehyde–aminoguanidine condensation and aminoguanidine self-condensation products: syntheses, crystal structures and characterization

et al. 2018

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Guanidine is the functional group on the side chain of arginine, one of the fundamental building blocks of life. In recent years, a number of compounds based on the aminoguanidine (AG) moiety have been described as presenting high anticancer activities. The product of condensation between two molecules of AG and one molecule of formaldehyde was isolated in the protonated form as the dinitrate salt (systematic name: 2,8-diamino-1,3,4,6,7,9-hexaazanona-1,8-diene-1,9-diium dinitrate), CHN·2NO, (I). The cation lacks crystallographically imposed symmetry and comprises two terminal planar guanidinium groups, which share an N-C-N unit. Each cation in (I) builds 14 N-H...O hydrogen bonds and is separated from adjacent cations by seven nitrate anions. The AG self-condensation reaction in the presence of copper(II) chloride and chloride anions led to the formation of the organic-inorganic hybrid 1,2-bis(diaminomethylidene)hydrazine-1,2-diium tetrachloridocuprate(II), (CHN)[CuCl], (II). Its asymmetric unit is composed of half a diprotonated 1,2-bis(diaminomethylidene)hydrazine-1,2-diium dication and half a tetrachloridocuprate(II) dianion, with the Cu atom situated on a twofold rotation axis. The planar guanidinium fragments in (II) have their planes twisted by approximately 77.64 (5)° with respect to each other. The tetrahedral [CuCl] anion is severely distorted and its pronounced `planarity' must originate from its involvement in multiple N-H...Cl hydrogen bonds. It was reported that [CuCl] anions, with a trans-Cl-Cu-Cl angle (Θ) of ∼140°, are yellow-green at room temperature, with the colour shifting to a deeper green as Θ increases and toward orange as Θ decreases. Brown salt (II), with a Θ value of 142.059 (8)°, does not fit the trend, which emphasizes the need to take other structural factors into consideration. In the crystal of salt (II), layers of cations and anions alternate along the b axis, with the minimum Cu...Cu distance being 7.5408 (3) Å inside a layer. The structures of salts (I) and (II) were substantiated via spectroscopic data. The endothermic reaction involved in the thermal decomposition of (I) requires additional oxygen. The title salts may be useful for the screening of new substances with biological activity.

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Section: Figuresupporting

confidence: 87%

Section: Figuresupporting

confidence: 56%

Formaldehyde–aminoguanidine condensation and aminoguanidine self-condensation products: syntheses, crystal structures and characterization

et al. 2018

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“…Many vanadium complexes of the oxalate dianion have been reported having biological (Kordowiak et al, 2000;Leó n et al, 2013) and catalysis applications (Mishra et al, 2002;Maurya et al, 2003). Many non-polymeric structural architectures of vanadium oxalate compounds have been reported, among which the synthesis of mononuclear bis(oxalato)dioxovanadate(V) complexes is limited to the easy formation of aquabis-(oxalato)oxidovanadate(IV) (Lin et al, 2004, Aghabozorg et al, 2007, Sehimi et al, 2016. Dioxovanadate(V) compounds have been studied less often; reported structures include triammonium bis(oxalato)dioxovanadate(V) dihydrate, (NH 4 )[VO 2 (C 2 O 4 ) 2 ]Á2H 2 O (Hoard et al, 1971;Atovmyan et al, 1972) and tripotassium bis(oxalato)dioxovanadate(V) trihydrate, K 3 [VO 2 (C 2 O 4 )]Á3H 2 O (Drew et al, 1974;Stomberg, 1986).…”

Section: Chemical Contextmentioning

confidence: 99%

Synthesis and structural study of tris(2,6-diaminopyridinium) bis(oxalato)dioxidovanadate(V) 2.5-hydrate

Sehimi

Akitsu

Zid

2019

Acta Crystallogr E Cryst Commun

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Crystals of the title compound, (C5H8N3)3[VO2(C2O4)2]·2.5H2O, a mononuclear VV complex, were obtained by slow evaporation at room temperature of an aqueous solution containing vanadium pentoxide, oxalic acid and 2,6-diaminopyridine. The asymmetric unit contains one bis(oxalato)dioxovanadate(V) anionic complex, three 2,6-diaminopyridinium cations and two and a half uncoordinated water molecules. The mononuclear vanadium(V) anions are connected to the organic cations and water molecules through a strong N—H...O and O—H...O hydrogen-bond network, consolidated by π–π stacking interactions, to form a three-dimensional structure.

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A novel Mn(II) oxalato-bridged 2D coordination polymer: synthesis, crystal structure, spectroscopic, thermal and magnetic properties

Sehimi

Zid

2018

J Chem Sci

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Besides the fact that direct synthesis of oxalate-based Mn(II) complexes did not succeed a lot due to the high insolubility of manganese oxalate (Mn II (C 2 O 4) • 2H 2 O), a new 2D polymeric Mn(II) salt has been synthesized by slow evaporation at room temperature and its structure has been determined by single-crystal X-ray diffraction. The structure was solved by direct methods and refined to conventional agreement indices. The crystal structure is built from anionic, two-dimensional, honeycomb networks formed by the oxalatebridged Mn(II) ions, interleaved by 2,6-diaminopyridinium cations that are entrapped between the layers. The interactions between adjacent layers result from the extended network of intermolecular hydrogen bonds created by the mentioned cations and water molecules. The complex has been fully characterized by single crystal X-ray diffraction, FT-IR and UV-Vis spectroscopy, Rietveld refinement, TGA-DSC analysis and magnetic susceptibility. The title compound exhibits antiferromagnetic coupling between Mn(II) centres.

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Crystal structure and spectroscopic analysis of a new oxalate-bridged Mn^IIcompound:catena-poly[guanidinium [[aquachloridomanganese(II)]-μ₂-oxalato-κ⁴O¹,O²:O^1′,O^2′] monohydrate]

Cited by 6 publications

References 27 publications

Formaldehyde–aminoguanidine condensation and aminoguanidine self-condensation products: syntheses, crystal structures and characterization

Formaldehyde–aminoguanidine condensation and aminoguanidine self-condensation products: syntheses, crystal structures and characterization

Synthesis and structural study of tris(2,6-diaminopyridinium) bis(oxalato)dioxidovanadate(V) 2.5-hydrate

A novel Mn(II) oxalato-bridged 2D coordination polymer: synthesis, crystal structure, spectroscopic, thermal and magnetic properties

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