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Issue 12, 2003
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The rôle of 4,7-phenanthroline in coordination polymer construction

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The reactions of 4,7-phenanthroline (4,7-phen) with a variety of metal salts have been investigated and the products structurally characterised by single crystal X-ray diffraction. Reaction of CoX2 (X = Cl, Br) or M(NO3)2 (M = Cd, Zn, Ni) salts with 4,7-phen all afford one-dimensional coordination polymers, [CoX2(4,7-phen)] (1, 2) or [M(NO3)2(4,7-phen)(H2O)] (M = Cd 3, Zn 4, Ni 5), in which the metal centres are linked via 4,7-phen ligands which act in a bridging bidentate manner. The remaining metal coordination sites are occupied by either halide (1, 2) or NO3 and H2O ligands (3–5). In{[Ni(NO3)2(4,7-phen)(H2O)]·(4,7-phen)}, 5 an additional, uncoordinated, molecule of 4,7-phen is included in the structure, hydrogen bonded to a coordinated H2O molecule. In contrast, reaction of CuX2 (X = Cl, Br) or Cu(NO3)2 with 4,7-phen leads to the formation of discrete complexes, [CuX2(4,7-phen)2] (X = Cl 6, Br 7, NO38) in which the N-donor ligand coordinates in a monodentate fashion and π–π interactions between coordinated 4,7-phen molecules generate an extended structure in the solid state. Investigation of the phase purity of 4 and 5 revealed that in the case of 4 the coordination polymer formed only in the presence of a previously reported hydrogen bonded structure, while 5 was shown to be contaminated with an unidentified phase. The rôle and diversity of the interactions adopted by 4,7-phen in forming coordination polymers and related species are discussed.

Graphical abstract: The rôle of 4,7-phenanthroline in coordination polymer construction

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Article information

11 Mar 2003
15 Apr 2003
First published
06 May 2003

Dalton Trans., 2003, 2387-2394
Article type

The rôle of 4,7-phenanthroline in coordination polymer construction

S. A. Barnett, A. J. Blake, N. R. Champness and C. Wilson, Dalton Trans., 2003, 2387
DOI: 10.1039/B302807K

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