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Structure and Bonding, Volume 10 by P, et al (eds), Hemmerich

By P, et al (eds), Hemmerich

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Eukaryotic cells comprise a plurality of organelles wonderful via their particular membranes and contents. Their biogenesis happens by way of development and department of preexisting buildings instead of de novo. Mitochondria and chloroplasts, which seem to be descended from prokaryotic ancestors, have retained a few DNA and the biosynthetic strength for its expression.

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52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 54 Waddington, T. C. : P h . D . dissertation, Cambridge (1955). Iqbal, Z. : Optics Communications, 2, 33 (1970). Klug, H. P. : Z. Krist. 85, 214 (1933). : Bull. Chem. Soc. J a p a n 36, 1032 (1963). Frevel, L. K. : Z. Krist. A 94, 197 (1936). Zvonkova, Z. , Zhadanov, G. S. : Zh. Fig. Khim. 23, 1495 (1949). Llewellyn, F. , Whitmore, F. E. : J. Chem. Soc. London 881 (1947). Choi, C. : Acts Cryst. B25, 2638 (1969). , Brown, C. , Mitra, S. S. : J. Chem.

4. Schematic projections of the unit cell of a) AgNCO b)AgCNO c) AgNCS down the c axis 33 Z. lqbal Detailed crystal structures of only a few of the other heavy metal pseudohalides are available in the literature. Among them are, cuprous azide which has a relatively simple tetragonal lattice and cupric azide, mercuric fulminate and ~r azide which have increasingly complex orthorhombic lattices. ,r azide has four types of anion sites of varying amounts of asymmetry (33) while cupric azide (35) and mercuric fulminate (J2) have two such sites.

Among the hydracids, however, the n-charge distribution of the pseudohalide groups are symmetrical only for HNCO and HNCS. The central atoms are seats of positive charge in the pseudohalide ions. This is nicely illustrated for N~ b y a well resolved doublet corresponding to the N ls electron binding energies in the photoelectron spectrum of crystalline sodium azide (75). Table 12. Bond Characters of Pseudohalide Ions (After Wagner (71)). 7964 Table 13. 06c) a) j. Alster (private communication) b) W.

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