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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, JaneNelson, Jane

Murphy, Brian P.Murphy, Brian P.

Drew, Michael G. B.Drew, Michael G. B.

Yates, Paul C.Yates, Paul C.

Nelson, S. MartinNelson, 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 CoII and CuII 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 = NiII and FeII, 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.

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Product name:LEAD(II) THIOCYANATE

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