On the Crystal Structures of cis- and trans-Bis(ethylenediamine)dinitrocobalt(III) Nitrate.

Börtin, Olle; Niklewski, T.; Nygren, Mats; Pohjonen, Marja‐Liisa; Koskikallio, Jouko

doi:10.3891/acta.chem.scand.30a-0657

Cited by 27 publications

(8 citation statements)

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“…The nitrite ions lie near the ideal axial sites with an average angle of 87.7 (3) ° between the nitrite nitrogen and the mean plane of the amine-N atoms. These bond lengths and angles are all in good agreement with those observed for similar trans-[Co(en)2(NO2)2]X complexes, such as the iodide and isothiocyanate (Bernal & Cetrullo, 1986) and nitrate (Bortin, 1976) complexes, and the related cissalts, such as the chloride (Bernal, 1985), iodide (Bernal et al, 1993) and nitrite (Marsh, 1997).…”

Section: Commentsupporting

confidence: 84%

trans-Bis(ethylenediamine)dinitrocobalt(III) perchlorate

Maxcy¹,

Turnbull²

1999

Acta Crystallogr C

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Section: Commentsupporting

confidence: 84%

trans-Bis(ethylenediamine)dinitrocobalt(III) perchlorate

Maxcy¹,

Turnbull²

1999

Acta Crystallogr C

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“…It was realized early [1] that the intercationic hydrogen bonding in that species was not only strong [2], but that it interfered with the process of conglomerate crystallization observed for the halides [1]. However, none of the interionic hydrogen bonds described by B6rtin [2] is as strong as those we have observed in the case of [ cis-Co(en)i(NO2)2](NO2).…”

Section: The Lowest Strain Energy Imposed On Bis-ethylenediamine Ringmentioning

confidence: 48%

“…The species with the strongest hydrogen bonding counteranion available until now was that of [cis-Co(en)2(NOz)2](NO3) (3), which was found [1,2] to have the symbol A(A~) [or that of its enantiomer, 2x(6A)]. It was realized early [1] that the intercationic hydrogen bonding in that species was not only strong [2], but that it interfered with the process of conglomerate crystallization observed for the halides [1].…”

Section: The Lowest Strain Energy Imposed On Bis-ethylenediamine Ringmentioning

confidence: 99%

“…The first report [1] in our series of studies on the mechanism of conglomerate crystallization of coordination compounds detailed the behavior of aminenitro derivatives of Co(III), such as [cis-Co(en)2(N02)2]C1 (2). In that report, it was suggested that there was a direct link between the ability of the oxygens of the cis-dinitro pair to form hydrogen bonds with the axial --NH2 hydrogens and the propensity of the substance to form crystalline conglomerates.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The phenomenon of conglomerate crystallization. XX. Spontaneous resolution in coordination compounds. XVIII.

1990

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The title compound, [cis-Co(en)2(NO2)2](N02) (1), crystallizes in the polar, nonenantiomorphic, monoclinic space group, Cc, with lattice constants: a = 9.198(2) •, b = 12.444(2), c = 9.963(3), and /3 = 96.76(2)~ V= 1132.39 ,~3 and d(calc; Z= 4) = 1.860 g cm 3. Thus, with NO2-as the counteranion, [cis-Oo(en)2(N02)2] crystallizes in a heterochiral lattice containing racemic pairs of cations, A total of 2699 data were collected over the range of 4 ~ -< 20 -< 70~ of these, 1859 (independent and with / -> 3~r (/)) were used in the structural analysis. Data were corrected for absorption (/~ = 15.465 cm -1) and the relative transmission coefficients ranged from 0.9934 to 0.7112. Refinement was carried out for both lattice polarities and the final R(F) and Rw(F) residuals were, respectively, 0.0242 and 0.0202 for (---) and 0.0264 and 0.0243 for (+++). Thus, the former was selected as correct for our specimen.Unlike all previous X-ray diffraction studies of the structural properties of the cation [cis-Co(en)2(N02)2] +, which are found to have a pair of oppositely configured en rings [i.e., ~(AB) or A(BA)], we find that in 1 the cations are in the lowest energy conformation and configuration; i.e., ~(AA) or A(8~). We attribute this change in configuration to the formation of strong interionic hydrogen bonds between nitrite anion oxygens and the axial--NH2 hydrogens, which markedly weaken the intermolecular and intramolecular hydrogen bonds between ligand --NO2 oxygens and the hydrogens of those same amine moieties. Thus, the nitrite anions behave exactly as nitrate *To whom correspondence should be addressed.anions, except that the hydrogen bonds found here are stronger than those formed by the latter. This is as expected since the negative charge is delocalized over two, instead of three, oxygens.

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“…The CoϪBr bond length at 2.422(1) Å lies in the range of values for this bond in other bromocobalt(III) complexes. [68] [69] The molecular structure of the S-sulfito complex cation in 13 is shown in Figure 4b. The coordination cap is essentially regular ( Table 1).…”

Section: )⋅H 2 O (12) and [(1)co(so 3 )]Br⋅3h 2 O (13)mentioning

confidence: 99%