The crystal structure of [Mg(H2O)6][VO(edta)] · 3.5H2O

Анцышкина, А. С.; Садиков, Г. Г.; Сергиенко, В. С.; Poznyak, A. L.

doi:10.1134/s0036023607040080

Cited by 3 publications

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“…The meridional (mer) position of the Promp ligand, associated with a strong deformation of metal cycles, is observed in the trans(O)-[Co(NH 3 ) 3 (Promp)] + cation [24] and in a square-pyramidal Cu(II) complex [14], but is impossible in the [Co(Promp) 2 ] -complex. As shown in [18] This type is characteristic of aminoacetate complexes (described in [2,6]); in this case, the C-O c bonds are noticeably longer than the C-O n bonds. The structures of two protonated complexes with S-aspartic acid H 2 NCH(CO 2 H)CH 2 CO 2 H (H 2 Asp) and diethylenetriamine (Dien, III) or N-methyldiethylenetriamine (Medien, IV) as extra ligands are also reported in [10,11].…”

Section: Resultsmentioning

confidence: 93%

“…For this purpose we selected a complex with cyanide ion as the additional X ligand stable toward aquation. 2 ] -ions was obtained following the procedure described in [18]. The solution was passed through a column with Sephadex DEAE-25 anion-exchange resin in the Cl -form, and then the dark pink zone of the adsorbed anions was eluted with a 0.1 M HCl solution; on slow evaporation, crystals of protonated complex H[Co(Promp) 2 ] · H 2 O (I) were obtained.…”

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confidence: 99%

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Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Poznyak

Burshtein

2005

Russ J Coord Chem

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Complex compounds in so-called acid form contain hydrogen atoms that are liberated as protons on dissolution. Different cases of localization of such mobile H atoms can be observed in crystals. It is not infrequent that crystallization water molecules undergo protonation to give oxonium ion, either individual or associated with different number of water molecules. Such compounds include crystals with complex anionsand [ Co ( Cdta )] -[1-4]. Protonation of coordinated acetate ion takes place in the [ Co ( en ) 2 ( CH 3 CO 2 )( CH 3 CO 2 H )]( ClO 4 ) 2 · H 2 O crystals: the acetate ions of two complex cations are bonded by a short hydrogen bond [5]. A similar situation is observed in the [Co ( H 3 Cdta )( CN ) 2 ] complexes [6] with coordinated acetate groups and in the [ Co ( Dtmp )( HAla )] HgCl 4 crystals with propionate groups of both ligands [7]. In crystals of [Co(HEddda)] · 2 H 2 O [8] and [ Co ( H 2 Eddp )( HEddp )] Br 2 · 4 H 2 O [9], the carboxylate group of one of the coordinated propionate chains is also protonated, but is bound by a short hydrogen bond with water molecule. 1 Some complexes were supposed to have protonated crystallization water molecules, rather than pro-1 The above-indicated ligands (written in abbreviated form as Gly, Ala, Dtmp, Ida, Edda, Eddp, Eddda, Cdta) are anions of amiacids, respectively; en is ethylenediamine. Another abbreviated forms used in the text will be interpreted further on.tonated carboxyl groups of six-membered cycles [10][11][12].The validity of such a supposition will be discussed below.In continuation of our previous X-ray diffraction studies of the acid Co(III) complexes with aminopropionate six-membered cycles [7-9], we investigated the structures of a complex with S -proline-N -mono-3-propionic acid ( H 2 Promp ). The structures of only two metal complexes (copper(II)) with this ligand have been reported recently [13,14].In all the above cases, protonated carboxyl group remains coordinated by the metal atom. However, as a result of protonation of the Co(III) complex with hexadentate ethylenediaminetetraacetic acid ( H 4 Edta ), one of the acetate branches of the ligand does not participate in coordination [15]. This fact is explained by sufficient strains in the [ Co ( Edta )] -ion arising due to involvement of the ligand atoms in five conjugated fivemembered metal cycles [16,17]. In this case, the greatest distortions are exhibited by aminoacetate cycles of G type, which are almost coplanar to the ethylenediamine cycle. It is exactly one of these cycles that is cleaved on protonation and on coordination of additional monodentate ligands. Therefore, it was of interest to study the mode of protonation of the [Co(Edta)X] complexes, which are less strained, since one acetate group is noncoordinated. For this purpose we selected a complex with cyanide ion as the additional X ligand stable toward aquation. Abstract -Crystal structures of [Co(Promp)(Hpromp)] · H 2 O ( I ) (where Promp and Hpromp are deprotonated and monoprotonated anions of S -proline-N -mono-3-pro...

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Section: Resultsmentioning

confidence: 93%

mentioning

confidence: 99%

Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Poznyak

Burshtein

2005

Russ J Coord Chem

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“…This supramolecular hydroxonium ion (Fig. 11;LOHJOH;Antsyshkina et al, 2000) features two extra-annular water molecules connected to an eight-membered ring consisting of two hydronium cations and six water molecules. H 14 O 6 2+ (XEMMEI; Wu et al, 2006).…”

Section: H 22 O 10 2+mentioning

confidence: 99%

Molecular and supramolecular ionic aggregates H_xO_y^zin organic and organometallic crystalline hydrates

Bernal

Watkins

2014

Acta Crystallogr C

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Ionic aggregates of the form H(x)O(y)(z) (z ≠ 0) have been characterized during an analysis of 245 crystal structures extracted from the Cambridge Structural Database [Allen (2002). Acta Cryst. B58, 380-388]. A systematic nomenclature is proposed for these species. Three modes of hydrogen bonding are described, characterized in part by the distance between contiguous O atoms: normal (NHB; O···O = 2.6-3.0 Å), charge assisted (CAHB; O···O = 2.5 Å) and molecular (MHB; O···O = 2.4 Å). The three modes are consistent with previous reports, our experimental results, and quantum-chemical-optimized geometries and energetics. No evidence is presented concerning the possible existence or stability of these aggregates in solution. Rather, emphasis is placed on the necessity in crystal structure analysis to develop thoroughly existing hydrogen-bonded networks, ignorance of which can lead to erroneous crystal structure models and other physico-chemical data associated with composition and charge balance.

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Low-temperature heat capacities and thermodynamic properties of Mn3(HEDTA)2·10H2O

Jiao

Song

Jiang

et al. 2010

J Therm Anal Calorim

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The crystal structure of [Mg(H2O)6][VO(edta)] · 3.5H2O

Cited by 3 publications

References 2 publications

Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Molecular and supramolecular ionic aggregates H_xO_y^zin organic and organometallic crystalline hydrates

Low-temperature heat capacities and thermodynamic properties of Mn3(HEDTA)2·10H2O

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The crystal structure of [Mg(H2O)6][VO(edta)] · 3.5H2O

Cited by 3 publications

References 2 publications

Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Protonated Co(III) Complexes with Ethylenediaminetetraacetic and S-Proline-N-Mono-3-propionic Acids. Crystal Structures of (H3O)[Co(HEdta)(CN)] · H2O and [Co(Promp)(HPromp)] · H2O

Molecular and supramolecular ionic aggregates HxOyzin organic and organometallic crystalline hydrates

Low-temperature heat capacities and thermodynamic properties of Mn3(HEDTA)2·10H2O

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Molecular and supramolecular ionic aggregates H_xO_y^zin organic and organometallic crystalline hydrates