Structure du complexe racémique (+–)-Co(en)₃(SCN)₃. Etude des liaisons hydrogène

Abstract

The crystal structure of (+)-Co(en)a(SCN)3 has been determined by single-crystal X-ray diffraction analysis. It is orthorhombic with space group Pbca. The lattice constants are a = 14.534 (4), b = 14.178 (6), c= 17.37 (1)/~, with eight formula units in the unit cell. The structure has been resolved by direct methods and refined by full-matrix least-squares analysis to a final R = 0.06 based on 4290 reflexions. [Co(en)3] 3+ and (SCN)-ions are linked by hydrogen bonds, which give a strong intermolecular cohesion to the structure. Two of the three independent (SCN)-groups have two hydrogen bonds to their S atom, and to their N atom -they bridge three complex ions [Co(en)3] 3+ -the third (SCN)-being linked to only one complex ion because its S atom is free. As a consequence of this strong cohesion, the covalent N-H and S-C-N bonds are perturbed (average N-H = 1.04/~ longer than N-H observed in ( __ )-Co(en)aCl3, and /S-C-N= 177"5°).

Tris(ethane-1,2-diamine-κ2N,N′)cobalt(III) carbonate iodide tetrahydrate

“…The thermodynamics of the outer sphere solution interaction of [Co(en) 3 ] 3+ with the carbonate ion (added as a carbonate salt) have been reported (Mironov, et al, 1973(Mironov, et al, , 1976. Similar structures containing the [Co(en) 3 ] 3+ cation have been reported (Brouty et al 1976;Liu et al, 1995).…”

“…For thermodynamics of the outer sphere solution interaction of [Co(en) 3 ] 3+ with the carbonate ion, see: Mironov et al (1973Mironov et al ( , 1976. For related structures containing the [Co(en) 3 ] 3+ cation, see: Brouty et al (1976); Liu et al (1995); Lappin et al (1993); Mizuta et al (1988).…”

Filiation structurale des complexes triéthylènediamine M (en)3 X m

“…Rfif6rences: (a) Nakatsu (1962); (b) Spinat, Whuler & Brouty (1979a); (c) Spinat, Whuler & Brouty (1979b); (d) Terberg (1939); (e) Iwata, Nakatsu & Saito (1969); (f) Whuler, Brouty, Spinat & Herpin (1977); (g) Whuler (1978); (h) Whuler, Brouty, Spinat & Herpin (1975); (i) Nakatsu, Saito & Kuroya (1956); (j) Whuler, Brouty, Spinat & Herpin (1976a); (k) Whuler, Brouty, Spinat & Herpin (1976b); (/) Whuler, Brouty, Spinat & Herpin (1976c); (m) Brouty (1978); (n) Brouty, Spinat & Whuler (1977); (o) Brouty, Spinat, Whuler & Herpin (1976); (p) Brouty, Spinat & Whuler (1979); (q) Brouty, Spinat, Whuler & Herpin (1977); (r) Brouty, Whuler, Spinat & Herpin (1977).…”

Détermination de la structure de (±)-Cr(en)3(SCN)3.0,75H2O: désordre conformationnel

“…faible que ceux observ+s pour les deux ions complexes ind~pendants [Cr(en)3] 3+ du compos6 monoclinique [Cr(en) (Raymond et al, 1968a) (1,9 et 1,7°), mais reste 6quivalent fi celui calculi pour l'ion [Co(en)3] 3+ du (+)-Co(en)3(SCN) a (Brouty, Spinat, Whuler & Herpin, 1976). Par contre, en ce qui concerne l'angle ~0 on retrouve une valeur toujours plus ~lev~e pour l'ion [Cr(en)3] 3+ que pour l'ion [Co(en)3 ]3+, cette distorsion semblant s'accentuer avec la sym&rie monoclinique Raymond et al, 1968a;Brouty et al, 1976). La configuration de l'ion (+)- [Cr(en) tant sur le troisi+me s'~crit: A [66(70% 6, 30% ,t)1 (IUPAC, 1970).…”