(−)589-[l-N,N,N',N'-tetrakis(2'-aminoethyl)-1,2-diaminopropane]cobalt(III) hexacyanocobaltate(III) trihydrate

New Configurationally Stable Chiral Building Blocks for Polynuclear Coordination Compounds: Ru(chiragen[X])Cl2

“…24,25 The violet fractions collected were combined, evaporated to dryness at 40 °C and recrystallized from chloroform/pentane, yielding 174 mg (90%). 1 H NMR (CDCl3, 300 MHz): δ 10.14 (d, 2H, 3 J ) 5.5 Hz), 7.96 (d, 2H, 3 J ) 7.6 Hz), 7.82 (t, 2H, 3 J ) 7.4 Hz), 7.74 (s, 2H), 7.52 (t, 2H, 3 J ) 5.8 Hz), 7.05 (t, 1H, 3 J ) 7.6 Hz), 6.88 (s, 2H), 6.84 (d, 2H, 3 J ) 7.7 Hz), 5.84 (s, 1H), 3.50 (dm, 2H, 2 J ) 15.6 Hz), 3.33 (br s, 2H), 2.93 (dd, 2H, 2 J ) 15.8 Hz, 3 J ) 6.6 Hz), 2.25 (dd, 2H, 3 J ) 5. 4 Hz, 4 J ) 5.4 Hz), 2.08 (td, 2H, 3 J ) 5.9 Hz, 2 J ) 10.1 Hz), 2.02 (td, 2H, 3 J ) 5.9 Hz, 3 J ) 1.8 Hz), 1.17 (s, 3H), 0.87 (d, 2H, 2 J ) 9.8 Hz), 0.42 (s, 3H).…”

“…Predetermination of chirality at an octrahedrally coordinated metal center (OC-6) has been achieved through various methods. For example, in the hexadentate ligand “mepenten” the configuration at the stereogenic center determines unambiguously the helical chirality at the metal center. , An R configuration at C(2) induces the configuration Δ 2 Λ in the octahedral coordination sphere. In the case of several pentadentate ligands, the chirality at the metal center is predetermined by the configuration of the ligand too. , We were interested to achieve chiral predetermination with tetradendate ligands in OC-6 complexes, so that the remaining two sites can be occupied by either two monodentate ligands or one bidentate ligand.…”

“…For example, in the hexadentate ligand "mepenten" the configuration at the stereogenic center determines unambiguously the helical chirality at the metal center. 1,2 An R configuration at C(2) induces the configuration ∆ 2 Λ in the octahedral coordination sphere. In the case of several pentadentate ligands, the chirality at the metal center is predetermined by the configuration of the ligand too.…”

Octahedral Complexes with Predetermined Helical Chirality: Xylene-Bridged Bis([4,5]-pineno-2,2‘-bipyridine) Ligands (Chiragen[o-, m-, p-xyl]) with Ruthenium(II)

“…In the case of hexadentate ligands, e.g. ( R )- N , N , N ‘, N ‘-Tetrakis(2-aminoethyl)-1,2-propanediamine or analogs thereof, , the complex is coordinatively saturated, whereas in the case of a pentadentate ligand, e.g. ( R,R )-alamp or ( R,R )-promp, , one coordination site can be occupied by an additional monodentate ligand.…”

Dissolution of water-insoluble [Co(en)3]2I2[Fe(CN)6]·4.6H2O in a saturated K4[Fe(CN)6] solution

“…All the eight compounds containing hexacyanometallate ions and octahedral complexes with polyamine ligands that we were able to find in the literature (only compounds with five-membered ethylenediamine bridges were considered) incorporated similar associates. [2][3][4][5][6][7][8][9] Because the [M(CN) 6 ][M'(NR) 6 ] 6 associate is present in crystal structures irrespective of the composition and stoichiometry of compounds, it should be regarded as a structure-forming unit in compounds of this type.…”