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.
Rational ligand design for metal ion recognition. Synthesis of a N-benzylated N2S3-donor macrocycle for enhanced silver(i) discrimination
作者:Ioana M. Vasilescu、David J. Bray、Jack K. Clegg、Leonard F. Lindoy、George V. Meehan、Gang Wei
DOI:10.1039/b613636m
日期:——
Four previously documented ligand design strategies for achieving Ag(I) discrimination have been applied to the design of a new N-benzylated N2S3-donor macrocycle; the latter shows high selectivity for Ag(I) over Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) in log K and bulk membrane transport studies.
Preparation and structures of the nickel(II) and silver(I) complexes of a 17-membered dibenzo macrocycle with an n2s3 donor set
作者:Uwe Kallert、Rainer Mattes
DOI:10.1016/s0277-5387(00)83317-3
日期:1992.1
The nickel(II) and silver(I) complexes [Ni(L1)ClO4]ClO4 and [Ag(L1)]ClO4 of the 17-membered dibenzo macrocyclic ligand L1 with an N2S3 donor atom set have been prepared and characterized by X-ray crystal structure determinations. Nickel(II) is octahedrally coordinated by the five donor atoms of L1 and a perchlorate oxygen atom. The overall symmetry of the [Ni(L1)]2+ moiety is close to m symmetry. In
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:——
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+