Proton and carbon-13 NMR studies of cis-eq- and trans-eq-ethylenediamine-N,N,N′-triacetatocobalt(III) and cis-eq-N-methylethylenediamine-N,N,′N′-triacetatocobaltate(III). Crystal structure of NH4cis-eq-[Co(ed3a)CN]

Maricondi, Chris; Utsuno, Shunji; Radanović, Dušan J.; Trifunović, Srećko R.; Abola, J.; Douglas, Bodie E.

doi:10.1016/s0020-1693(00)80672-6

Cited by 22 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The other two glycinate cycles bonded to different N atoms of the Edta ligand are almost perpendicular to the equatorial plane; they are labeled with the symbols R 1 and R 2 . A similar geometrical isomer of [Co(X)(Edta)] complexes is called cis-equatorial isomer [27].…”

Section: Resultsmentioning

confidence: 99%

“…The Co-N(1) bond in structure II is elongated, probably, due to the trans-effect of the CN -ligand. This can be seen from the structure of NH 4 [Co(CN)(Edtra)] [27], where the Co-N bond length in the trans-position to the CN -ion is equal to 1.97 Å, while the Co-N distance (Edtra) in the cis-position with respect to the CNligand to the N atom, which has no free acetate chain, is considerably less (1.93 Å).…”

Section: Resultsmentioning

confidence: 99%

“…The only one O···O contact between the neighboring complexes is realized with participation of noncoordinated carboxyl group of complex A as a proton donor (position 1, Table 5). The Co-CN fragment in structure II has standard geometry, as in the [Co(CN)(Hedta)] - [34] or [Co(CN)(Edtra)] - [27] complexes; the CN ligand is not protonated. Therefore, one can suggest protonation of two crystallization water molecules of four water molecules present in asymmetric cell of crystals II.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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...

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…The other metal-donor distances are within the expected range of 1.996(2)Å to 2.050(2) A (1) and 2.008(3)Å to 2.074(3)Å (2). [3][4][5]23 The cis angles are in the range of 83.0(7) to 98.6(7) for (1) and 83.0(1) to 97. 4(1) for (2), and the trans angles vary between 169.0(8) and 178.6(7) for (1) and 168.1(1) and 178.3(1) for (2).…”

Section: Description Of the Crystal Structuresmentioning

confidence: 99%

“…Most of the reported [M(ed3a-type)X] complexes (M ¼ Co III , Cr III , Cu II , Ni II and X ¼ monodentate ligand) have the cisequatorial conguration. [3][4][5] The success of cisplatin as antitumor agent has stimulated enormous efforts to designing and preparing other clinically useful metal complexes. [6][7][8][9][10] Rh III coordination compounds are isoelectronic with Ru II and Pt IV complexes, which provide a range of active antitumor agents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural analysis, solution equilibria and biological activity of rhodium(iii) complexes with a quinquedentate polyaminopolycarboxylate

et al. 2017

View full text Add to dashboard Cite

show abstract

ChemInform Abstract: Proton and 13C NMR Studies of cis‐eq‐ and trans‐eq‐Ethylenediamine‐N,N,N′‐triacetatocobalt(III) and cis‐eq‐N‐Methylethylenediamine‐N,N′,N′‐triacetatocobaltate(III). Crystal Structure of NH4cis‐eq‐(Co(ed3a)CN).

et al. 1988

View full text Add to dashboard Cite

show abstract

Proton and carbon-13 NMR studies of cis-eq- and trans-eq-ethylenediamine-N,N,N′-triacetatocobalt(III) and cis-eq-N-methylethylenediamine-N,N,′N′-triacetatocobaltate(III). Crystal structure of NH4cis-eq-[Co(ed3a)CN]

Cited by 22 publications

References 25 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

Synthesis, structural analysis, solution equilibria and biological activity of rhodium(iii) complexes with a quinquedentate polyaminopolycarboxylate

ChemInform Abstract: Proton and 13C NMR Studies of cis‐eq‐ and trans‐eq‐Ethylenediamine‐N,N,N′‐triacetatocobalt(III) and cis‐eq‐N‐Methylethylenediamine‐N,N′,N′‐triacetatocobaltate(III). Crystal Structure of NH4cis‐eq‐(Co(ed3a)CN).

Contact Info

Product

Resources

About