Search

In the β form of tris(thiocyanato-N)[2,7,13,18-tetramethyl-3,6,14,17,23,24-hexaazatricyclo[17.3.1.1 8,12 ]-tetracosa-1(23),2,6,8(24),9,11,13,17,19,21-decaene-N 3 ,N 6 ,N 14 ,N 17 ,N 23 ,N 24 ]europium, the nine-coordinate Eu III ion is bound to the N atoms of three monodentate isothiocyanate ligands and to the six N atoms of the macrocyclic ligand L (C 22 H 26 N 6 ), which has an 18-membered six-N-atom donor cavity, with a coordination geometry analogous to that of the α form.

PA, C18H14C12N20282, Mr=425.36, tri- clinic, P1 (after structure determination), a-- 11.232(2), b=10.465(2), c=8.386(2) A, a= 107-07 (3), fl = 83-63 (4), y = 98.90 (3) °, V= 928.7 (4)/~3, Z = 2, Dx = 1.521 g cm -3, ,~(Mo Ka) = 0.71069 A,/1, = 5.27 cm -~, F(000)= 436, room tem- perature. Final conventional R value is 0.033 (wR = 0.041) for 2716 diffractometer-measured intensities with I___ 3tr(l). The molecular structure is charac- terized by the different conformations of the two thiazolidine rings, one of which is an envelope, and by opposite chirality of the two asymmetric C atoms. In the crystal structure both the enantiomers 2S,2'R and 2R,2'S are present. PB, CI8HI4C12N20282, Mr = 425.36, orthorhombic, Pbcn, a=7.759(2), b= 19.625 (4), c = 12.504 (3) A, V= 1904.0 (6) A 3, Z = 4, Dx = 1.483 g cm -3, a(Mo Ka) = 0.71069 A, /1, = 5.14cm -I, F(000)= 872, room temperature. Final conventional R value is 0.049 (wR = 0.067) for 1334 diffractometer-measured intensities with I_> 3tr(l). Because the molecular structure has exact C2 sym- metry, the two phenyl rings are strictly parallel and the conformations (half chair) of the two thiazolidine rings are the same as well as the chirality of the two asymmetric C atoms. Nevertheless both enantiomers 2R,2"R and 2S,2"S are in the crystal.

C 8 H 6 N 2 O 2 , M r =162.15, monoclinic, P2 1 /n, a=10.402 (2), b=15.025 (3), c=9.467 (2) A, β=96.24 (3) o , V=1470.8 (5) A 3 , Z=8, D m (flotation in heptane/carbon tetrachloride)=1.45, D x =1.46 Mg m -3 , λ(Mo Kα)=0.71069 A, μ=0.102 mm -1 , F(000)=672, T=295 K, R=0.041 (wR=0.048) for the 2105 observed reflections with I≥2.5σ(I). In both molecules of the asymmetric unit the carboxy group prefers a near coplanar [4.8 (1) and 5.4 (1) o ] and transoid orientation with respect to the strictly planar heterocyclic ring

The title compound, di-μ-diethyl­amido-N:N-bis­[chloro­di­methyl­tin(IV)], consists of discrete [Sn2Cl2(CH3)4(C4H10N)2] dimer mol­ecules, with Sn atoms linked by bridging diethyl­amido groups. The coordination geometry about the metal atom is distorted trigonal bipyramidal, with the two methyl C atoms and one N atom in the equatorial plane, and the Cl and second N atom in axial positions.

C13H10ClO2NS, Mr = 279.75, monoclinic, P2(1)/a, a = 14.490 (3), b = 22.598 (5), c = 7.336 (2) A, beta = 92.4 (1) degree, U = 2400 (1) A3, Z = 8, D chi = 1.548 g cm-3, lambda(Mo K alpha) = 0.71069 A, mu = 2.07 cm-1, F(000) = 1152, room temperature, R = 0.037 for 2423 independent reflections with I greater than or equal to 3 sigma(I). Each unit cell contains two independent molecules which differ mainly in the orientation of their N(CH3)2 groups. The two tricyclic moieties of each molecule are not coplanar, the pyran ring being tilted by 7.9 (1) degree with respect to the benzene ring in molecule 1 and by 8.7 (1) degree in molecule 2. There are weak interactions between the molecules involving the carboxylic O atoms and the H atoms of the phenyl moieties.

Le compose du titre cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 /a. Affinement de la structure jusqu'a 0,064. La geometrie de coordination du complexe cationique [Co(picdien)(H 2 O] 3+ est pratiquement octaedrique

Le compose du titre cristallise dans le systeme monoclinique avec le groupe d'espace P2 1/c . Affinement de la structure jusqu'a 0,041. Deformation angulaire du cycle phenyle de l'anion. Dans le cation, les groupes methyle se trouvent de part et d'autre du plan central N-C-N