THE INTERACTION OF TRANSITION AND POST-TRANSITION METAL IONS WITH 14- AND 16-MEMBERED TRANS N(2)X(2)-DONAR MACROCYCLES (X=NH,O,S) - STABILITIES AND X-RAY STRUCTURES

摘要

A comparative investigation of the 1:1 (metal/ligand) complex stabilities of 14- and 16-membered derivatives of dibenzo-substituted macrocycles incorporating trans-N2O2, -N2S2 and -N-4 donor sets towards Co(II), Ni(II), Cu(II), Zn(II), Cd(LI), Ag(I) and Pb(II) ions has been carried out with emphasis on the influence of systematic donor atom variation on the respective 1:1 stability constants. For comparison, previously determined log K values for corresponding cis-N2O2 and -N-4 donor ligand systems are also discussed. The crystal structures of the nickel(II) thiocyanate complexes of the 14-membered N-4(diamine) and precursor N-4(diimine) macrocycles are also presented. C20H24N6NiS2 crystallised in the triclinic space group P (1) over bar (No. 2) with a = 8.913(2) Angstrom, b = 9.441(2) Angstrom, c = 13.583(3) Angstrom, a = 94.29(2)degrees, beta = 107.48(2)degrees, gamma = 90.90(2)degrees and Z = 2. C20H20N6NiS2 . CH3CN crystallised in the monoclinic space group P2(1) (No. 14) with a = 10.321(2) Angstrom, b = 13.855(8) Angstrom, c = 17.435(1) Angstrom, beta = 102.59(10)degrees and Z = 4. [References: 34]