Alkali Metal Complexes with Organic Ligands - download pdf or read online

By J. D. Dunitz

Content material: Molecular modelling and bonding / Elaine Moore -- Case examine : Molecular modelling in rational drug layout / man furnish and Elaine Moore

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60 7 2 4 5 100 -- >220 -- > . . . . . Rb+JCs + . . . . . 5 -. -- -- -- -- -- 1260 4000 -. . -- SrS+JCa2+ . . . 5 . . . B a S + / S r ~+ . -M. Lehn Topological Factors The chelate effect is a celebrated feature of the chemistry of transition metal complexes. Ligands containing an increasing number of rings show several such ring order effects. A chelate effect is expected to be operative in ligand 2 as compared with dimethylether, for example; unfortunately, the stability constants for the latter compound are not known.

The fact that the association rates differ less than the dissociation rates (which follow the stability sequence) could indicate that the transition state is nearer to the reagents than to the complex. Furthermore the slowness of the association could be explained b y the operation of the following effects on the way to the transition state: a) incomplete compensation of the interaction between the cation and removed solvent molecule(s) b y the interaction with the entering binding site(s), or removal of several molecules at once; b) a conformational change in the ligand.

3 b) -- 3 . 6 ( i n W ) -- Ag+ (65) (65) (135) (65) (65) (65) (65) (65) (65) {65) (65) (65) (65) (65) Ref. Stability Constant (log Ks) o/alkali and alkaline-earth metal cation complexes with ligands o] type D ( K s in lmo1-1 at 25 ~ 6 Compound Table M 26 : M 25 b) e) a) e) a) -- M 24 . 0 . 5 w a t e r ; M: methanol. Results from ref. 105. F o r 1 2 a n d I 8 one h a s also: Mg2+, Ca2+ < S r 2 + (105). 9. 9. -- -- -- M 28 W 70/30 -- -- 95[5 M/W -- M/W M/W -- M 21 -- -- M 20 M -- lV[ 19 22 -- M 18 70/30 .

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Alkali Metal Complexes with Organic Ligands by J. D. Dunitz


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