Macrocyclic ligand design. Effect of donor-set and ringsize variation on silver(I)/lead(II) discrimination within an extended series of dibenzo substituted rings
摘要:
The effect of systematic variation of the donor-atom set within dibenzo-substituted, 17- to 20-membered macrocycles on their ability to discriminate between silver(I) and lead(II) has been investigated. The log K values for the respective complexes. determined potentiometrically in 95% methanol (l = 0.1 mol dm(-3), NEt(4)ClO(4)), show that successive replacement of either nitrogen or oxygen heteroatoms by thioether donors leads to increasing affinity for silver(I) relative to lead(II), as does the incorporation of an 'aliphatic' NON or NSN donor sequence in the structure. For the 17-membered system incorporating a S2N2S-donor set, exceptional discrimination (of the order of 10(9)) was observed. The characterisation of selected complexes has included the crystal structure of the sliver perchlorate complex of the 17-membered ON2S2 macrocycle (L(17)). The silver ion in [AgL(17)]ClO4 has a very distorted trigonal-bipyramidal geometry with all metal to donor bond lengths appearing normal. The complex crystallises in the monoclinic space group P2(1)/n with lattice parameters a = 19.410(4), b = 9.602(2), c = 12.747(3) Angstrom, beta = 103.67(2)degrees and Z = 4.
Dalton communications. Metal-ion recognition. Donor-set control of silver(I)/lead(II) discrimination using mixed-donor macrocyclic ligands
作者:Kenneth R. Adam、Darren S. Baldwin、Alan Bashall、Leonard F. Lindoy、Mary McPartlin、Harold R. Powell
DOI:10.1039/dt9940000237
日期:——
The systematic variation of the donor atom set in a dibenzo-substituted, 17-membered ring structure on the ability of the resultant systems to discriminate between silver(I) and lead(ll) has been performed; the compound containing a S2N2S-donor set yielded discrimination of the order of 10(9) in favour of silver(I).
Baldwin, Darren; Lindoy, Leonard F.; Graddon, Douglas P., Australian Journal of Chemistry, 1988, vol. 41, # 9, p. 1347 - 1352
作者:Baldwin, Darren、Lindoy, Leonard F.、Graddon, Douglas P.
DOI:——
日期:——
Adam, Kenneth R.; Arshad, Shatira P. H.; Baldwin, Darren S., Inorganic Chemistry, 1994, vol. 33, # 6, p. 1194 - 1200
作者:Adam, Kenneth R.、Arshad, Shatira P. H.、Baldwin, Darren S.、Duckworth, Paul A.、Leong, Anthony J.、Lindoy, Leonard F.、McCool, Brian J.、McPartlin, Mary、Tailor, Bhupesh A.、Tasker, Peter A.
DOI:——
日期:——
BALDWIN, DARREN;DUCKWORTH, PAUL A.;ERICKSON, GARY R.;LINDOY, LEONARD F.;M+, AUSTRAL. J. CHEM., 40,(1987) N 11, 1861-1872
作者:BALDWIN, DARREN、DUCKWORTH, PAUL A.、ERICKSON, GARY R.、LINDOY, LEONARD F.、M+