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C C(1) C(2) C(3) C(4) C(5) C(6) C(7) C(8) REGULAR STRUCTURAL PAPERS Toby, B. H., Hughey, J. L. IV, Fawcett, T. G., Potenza, J. A. & Schugar, H. J. (1981). Acta Crvst. B37, 1737-1738. Whimp, P. O., Bailey, M. F. & Curtis, N. F. (1970). J. Chem. Soc. A, pp. 1956-1963. Whimp, P. O. & Curtis, N. F. (1966). J. Chem. Soc. A, pp. * Perchlorate O-atom occupancy factor of 0.7. i Perchlorate O-atom occupancy factor of 0.6. Table 2. Selected bond distances (tk) and angles (o) Co--O(1) Co--NO) Co--N(2) CI--O(3) CI--O(4) C1--O(5) O(l)--C O(2)--C N(I)--C(1) O(1)--Co--O(la) O(1)--Co--N O(l)--Co--N(la) O(l)--Co--N(2a) O(1)--Co--N(2) N(I)--Co--N(la) N(I)--Co--N(2) N(1)--Co--N(2a) N(I)--C(I)--C(2) N(2)--Co--N(2a) N(2)--C(2)--C(1) N(2)--C(3)--C(4) N(2)--C(3)--C(5) N(2)--C(3)--C(6a) C(4)--C(3)--C(5) N(1)--C(7) N(2)--C(2) N(2)--C(3) C(1)--C(2) C(3)--C(4) C(3)--C(5) C(3)--C(6a)* C(6)--C(7) C(7)--C(8) CO)--C(3)--C(6a) C(5)--C(3)--C(6a) Co--O(1)--C C(3a)--C(6)--C(7) Co--N(1)--C(1) Co--N(I)--C(7) N(1)--C(7)--C(6) N(1)--C(7)--C(8) C(I)--N(I)--C(7) C(6)--C(7)--C(8) Co--N(2)--C(2) Co--N(2)--C(3) C(2)--N(2)--C(3) O(l)--C--O(la) O(1)--C--O(2) * Atoms related to those in the crystallographic asymmetric unit by the molecular twofold axis ( - x , - y , - z ) are designated by the letter a following the atom number. The authors thank the National Science Council for support under grants NSC81-0208-M007-110 and NSC81-0208-M007-86. They are also indebted to Ms Shu-Fang Tung for collecting the X-ray diffraction data. Lists of structure factors, anisotropic thermal parameters and H-atom co- ordinates have been deposited with the British Library Document Sup- ply Centre as Supplementary Publication No. SUP 71280 (6 pp.). Copies may be obtained through The Technical Editor, International Union of Crystallography, 5 Abbey Square, Chester CH 1 2HU, England. [CIF ref- erence: AS 1029] References Bang, E. & Monsted, O. (1984). Acta Chenl. Scamt. Set. A, 38 Burke, M. R. & Richardson, M. F. (1983). hu~rg. Chhn. Acta. 69, Curtis, N. F. & Curtis, Y. M. (1965). hu~rg. Chem. 4, 804-809. Gabe, E. J., Le Page, Y., White, P. S. & Lee, F. L. (1987). Acta Cryst. A43, C-294. Kenohan, J. A. & Endicott, J. F. (1969). J. Am. Chem. Soc. 91, North, A. C. T., Phillips, D. C. & Mathews, F. S. (1968). Acta Crvst. A24, 351-359. Sheu, H.-R., Lee, T.-J., Lu, T.-H., Liang, B.-F. & Chung, C.-S. (1983). Proc. Natl Sci. Cotmc. ROC, 7, I ! 3-118. © 1993 International Union of Crystallography Printed in Great Britain - all rights reserved Acta Cryst. (1993). C49, 1914-1916 Structure of (rac-5,5,7,12,12,14-Hexa- methyl- 1,4,8,11-tetraazacyclotetradecane)- silver(II) Diperchlorate Dihydrate HENRY N . PO AND SHU-CHIN SHEN Department o f Chemistry, California State University, Long Beach, CA 90840, USA ROBERT J. DOEDENS* Department of Chemistry, University of Cal(fornia, Irvine, CA 92717, USA (Received 9 December 1992, accepted 29 April 1993) Abstract The product of the reaction of silver(II) perchlorate with the racemic form of 5,5,7,12,12,14-hexamethyl- 1,4,8,11-tetraazacyclotetradecane (tet b) contains dis- crete [Ag(tet b)] 2+ and C104 ions with no axial A g - - O bond. The cation has crystallographic two- fold symmetry and a nonplanar coordination environment about the metal ion. The mean A g - - N distance is 2.162 (5) A. Comment The tetraaza macrocycle 5,5,7,12,12,14-hexamethyl- 1,4,8,11-tetraazacyclotetradecane can exist in two diastereoisomeric forms, based on the relative con- figurations of the C atoms at ring positions 7 and 14. In the C-meso form (tet a), these two C atoms are of opposite configurations, R and S, while in the C- racemic form (tet b) they are of the same configura- tion. Both tet a and tet b form stable complexes with silver(II). tet a tet b Acta Crystallographica Section C ISSN 0108-2701 ©1993 |
