Binucleating N624- and 26-Membered Macrocyclic Ligands. Part 2. Transitionmetal Homo- and Hetero-binuclear Complexes: X-Ray Crystallographic Structure Determination of a Lead-Manganese Heterobinuclear Complex

DOI: 10.1039/DT9880001001

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1001 - 1010 (1988)

Update date:2022-08-30

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Authors:

Nelson, Jane

Murphy, Brian P.

Drew, Michael G. B.

Yates, Paul C.

Nelson, S. Martin

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Article abstract of DOI:10.1039/DT9880001001

Template condensation products of 1,5-diaminopentane and 1,6-diaminohexane with 2,6-diacetylpyridine on Pb(NCS)2 have been transmetallated with Co^II and Cu^II to yield homobinuclear complexes of the 24- and 26-membered macrocycles, L¹ and L² respectively.In the dicobalt(II) complex of the smaller macrocycle, L¹, a thermally populated spin equilibrium exists lying well to the low-spin side at 93 K.E.s.r. spectra indicate the complex has an equatorially compressed tetragonal geometry.The dicobalt(II) complex of the larger macrocycle, L², is effectively high-spin, down to 93 K.Dicopper(II) complexes of L¹ display a weak antiferromagnetic interaction, absent in analogous complexes of L².Heterobinuclear complexes 1(NCS)2(MeCN)2>2 of the 24-membered macrocycle heve been prepared for M = Ni^II and Fe^II, as confirmed by fast-atom bombardment (f.a.b.) mass spectra.An X-ray crystallographic structure determination on the heterobinuclear complex PbMnL¹(NCS)4 reveals a Pb-Mn distance of 4.857(2) Angstroem and confirms that the metal centres are bridged by two 1,3-μ-NCS-bridges, as inferred from i.r. spectroscopy for the other thiocyanato complexes studied.However, the X-ray structure shows that in this case the thiocyanate bridges present both S-donors to Pb and both N-donors to Mn.

Full text of DOI:10.1039/DT9880001001

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