The phenomenon of conglomerate crystallization—XXXII. The crystallization behaviour of [cis-Co(en)2(NO2)2]I (I). Counter-ion effects on crystallization pathway of racemate solutions—III

The phenomenon of conglomerate crystallization: XXXVII: The crystallization behavior of the Cr(III) and Co(III) amine carbonates [Cr(en)2CO3]I (I) and NH4{[cis-β-Co(trien)Co3]2}(PF6)3 (II)

“…Nonetheless, both structural results are sufficiently well documented by the analyses that the following facts are certain: (a) the space group is unambiguously identified by the systematic absences, in both cases P2Jc; therefore, these substances crystallize as racemates; (b) the iodides [Co(en)2(C204)]I [5] and [cis-Co(en)2(N02)2]I [13] suffer from similar problems of crystallize quality. Moreover, the ratio of parameters to data observed for (I1) is unfavorable to quality of refinement in part due to the large number of atoms in the asymmetric unit and partly to the fact that lattice disorder goes hand in hand with a lowering of the number of observed data and the quality of those measurable.…”

“…Moreover, the ratio of parameters to data observed for (I1) is unfavorable to quality of refinement in part due to the large number of atoms in the asymmetric unit and partly to the fact that lattice disorder goes hand in hand with a lowering of the number of observed data and the quality of those measurable. This problem of crystal quality in the iodides may be connected with their demonstrated ambiguity in selecting a crystallization pathway and has been discussed previously [5,13]. Their structures were solved, but the oxalato structure [5] was of very poor quality, while that of the cis-dinitro compound was somewhat better behaved [13] (it still was not of high quality either; for details, see Refs.…”

“…The space group is either P41 or P412~2; we favor the latter in view of the fact that (-)ss9-[cis-[A(~)-Co(en)2oxalato]I crystallizes in that space group [13]. V = 528.11 A, 3, M. W. = 319.05 g mole -I, d (z = 2) = 2.006 gcm -3.…”

The phenomenon of conglomerate crystallization. Part 40: The crystallization behavior oftrans- Co(III) amines (+)546-trans-[Co(3,2,3-tet)(NO2)2]Cl·3H2O (I), (−)589 -trans-[Co(3,2,3-tet)Cl2]NO3 (II), and of (+)546-trans-[Co(3,2,3-tet)(NO2)2]NO3 (III)

“…[21][22][23][24] we demonstrated that crystals obtained by conglomerate crystallization are isomorphous and isostructural with those obtained from preresolved material. Certainly under comparable crystallization conditions this appears to be the case.…”

Alfred Werners Koordinationschemie: neue Erkenntnisse aus alten Proben

“…[38] Aus Daten zur Lçslichkeit von Racemat und reinen Enantiomeren wurde die spontane Trennung für flavo-Bisethylendiamindinitrocobaltchlorid (2) und -bromid (3) sowie deren absolute Konfigurationen mithilfe der BijvoetMethode. [39] Eine Rçntgenstrukturanalyse des reinen Enantiomers von 3 wurde zuerst 1988 verçffentlicht. [40] Für 2 und 3, die beide in der Raumgruppe P2 1 kristallisieren, wurde von Bernal eine spontane Spaltung berichtet.…”