Metal Complexes of Molecular Clefts. The Synthesis and X-Ray Crystal Structures of a Mononuclear Barium and Four Binuclear Silver(I) Complexes of Bibracchial Tetraimine Schiff-base Macrocycles

DOI: 10.1039/DT9900001271

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1271 - 1283 (1990)

Update date:2022-07-30

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Authors:

Adams, Harry

Bailey, Neil A.

Carlisle, W. Daniel

Fenton, David E.

Rossi, Gentilina

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Article abstract of DOI:10.1039/DT9900001271

Mononuclear barium and binuclear silver(I) complexes of bibracchial tetraimine Schiff-base macrocycles L¹-L⁴ derived from the '2+2' condensation of 2,6-diacetylpyridine and the functionalised triamines N,N-bis(2-aminoethyl)-2-(aminomethyl)pyridine, N,N-bis(3-aminopropyl)-2-(aminomethyl)pyridine, N,N-bis(3-aminopropyl)-2-methoxyethylamine, and N,N-(3-aminopropyl)-2-methoxybenzylamine, respectively, have been synthesised.The crystal structures of five complexes have been determined: 1>2 crystallises in the monoclinic space group C2/c (C_2h⁶, no.15) and has unit-cell dimensions a = 20.310(38), b = 14.453(41), c = 15.137(29) Angstroem, β = 104.84(15) deg, and Z = 4; 1>2 crystallises in the tetragonal space group /4₁cd (C_4v¹², no.110) with a = 28.11(4), c = 21.618(16) Angstroem, and Z = 16; 2>2*0.5H2O crystallises in the triclinic space group P1 (C_i¹, no.2) with a = 12.277(16), b = 13.899(14), c = 15.260(50) Angstroem, α = 77.30(20), β = 70.17(20), γ = 71.29(9) deg, and Z = 2; 3>2*0.5 H2O crystallises in the triclinic space group P1 (C_i¹, no.2) with a = 14.171(14), b = 18.323(16), c = 12.495(23) Angstroem, α = 99.20(12), β = 120.13(11), γ = 116.35(7) deg, and Z = 2; 4>2 crystallises in the monoclinic space group P2₁/a (C_2h⁵, no.14), a = 16.595(16), b = 13.363(11), c = 23.951(25) Angstroem, β = 105.43(8) deg, and Z = 4.The macrocycles fold to present molecular clefts into which the metals co-ordinate.Modification of the ring size and of the nature of the donor atom in the pendant arm leads to the Ag...Ag separation in the binuclear silver(I) complexes varying from 2.9 to 6.9 Angstroem.

Full text of DOI:10.1039/DT9900001271

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