TY - JOUR

T1 - Molecular Pac-Men and Tacos: Layered Cu(II) cages from ligands with high binding site concentrations

AU - McDonald, C.

AU - Williams, D.W.

AU - Comar, P.

AU - Coles, S.J.

AU - Keene, T.D.

AU - Pitak, M.B.

AU - Jones, L.F.

PY - 2015/6/24

Y1 - 2015/6/24

N2 - The in-situ formation and subsequent Cu(II) ligation of the polydentate pro-ligands o-[(E)-(2-hydroxy-3-methoxyphenyl)methylideneamino]benzohydroxamic acid (L1H3), o-[(E)-(2-hydroxy-3-methoxy-5-bromophenyl)methylideneamino]benzohydroxamic acid (L2H3) and o-[(E)-(2-hydroxyphenyl)methylideneamino]benzohydroxamic acid (L3H3), leads to the self-assembly of the cages [Cu(II)10(L1)4(2-aph)2(H2O)2](ClO4)4•5MeOH•H2O (1), [Cu(II)14(L1)8(MeOH)2.5(H2O)7.5](NO3)4•3MeOH•7H2O (2), [Cu(II)14(L2)8(MeOH)6(H2O)8](NO3)4•2MeOH•6H2O (3), [Cu(II)14(L3)8(MeOH)6(H2O)2](NO3)4•6MeOH•10H2O (4) and [Cu(II)30O(OH)4(OMe)2(L1)16(MeOH)4(H2O)2](ClO4)4•2MeOH•27H2O (5). Each member comprises a highly unusual topology derived from off-set, stacked, near planar layers of polynuclear subunits connected through long Cu(II)-O contacts. The exact topology observed is dependent on the specific reaction conditions and methodologies employed. Dc magnetic susceptibility studies on 1, 2, 4 and 5 reveals strong antiferromagnetic exchange between the Cu(II) centres in all siblings. We also present the 1D coordination polymer {[Cu(II)(L4)]·H2O}n (6) comprising the pseudo macrocyclic ligand [[2-[(E)-(2-hydroxy-3-methoxy-phenyl)methyleneamino]benzoyl]amino]ethanimidate (L4H2), which is formed upon the incorporation of an MeCN unit at the hydroxamate group of precursor ligand L1H3.

AB - The in-situ formation and subsequent Cu(II) ligation of the polydentate pro-ligands o-[(E)-(2-hydroxy-3-methoxyphenyl)methylideneamino]benzohydroxamic acid (L1H3), o-[(E)-(2-hydroxy-3-methoxy-5-bromophenyl)methylideneamino]benzohydroxamic acid (L2H3) and o-[(E)-(2-hydroxyphenyl)methylideneamino]benzohydroxamic acid (L3H3), leads to the self-assembly of the cages [Cu(II)10(L1)4(2-aph)2(H2O)2](ClO4)4•5MeOH•H2O (1), [Cu(II)14(L1)8(MeOH)2.5(H2O)7.5](NO3)4•3MeOH•7H2O (2), [Cu(II)14(L2)8(MeOH)6(H2O)8](NO3)4•2MeOH•6H2O (3), [Cu(II)14(L3)8(MeOH)6(H2O)2](NO3)4•6MeOH•10H2O (4) and [Cu(II)30O(OH)4(OMe)2(L1)16(MeOH)4(H2O)2](ClO4)4•2MeOH•27H2O (5). Each member comprises a highly unusual topology derived from off-set, stacked, near planar layers of polynuclear subunits connected through long Cu(II)-O contacts. The exact topology observed is dependent on the specific reaction conditions and methodologies employed. Dc magnetic susceptibility studies on 1, 2, 4 and 5 reveals strong antiferromagnetic exchange between the Cu(II) centres in all siblings. We also present the 1D coordination polymer {[Cu(II)(L4)]·H2O}n (6) comprising the pseudo macrocyclic ligand [[2-[(E)-(2-hydroxy-3-methoxy-phenyl)methyleneamino]benzoyl]amino]ethanimidate (L4H2), which is formed upon the incorporation of an MeCN unit at the hydroxamate group of precursor ligand L1H3.

U2 - 10.1039/C5DT01463H

DO - 10.1039/C5DT01463H

M3 - Article

VL - 44

SP - 13359

EP - 13368

JO - Dalton Transactions

JF - Dalton Transactions

SN - 1477-9226

IS - 29

ER -