Interplay between the supramolecular motifs of polypyridyl metal complexes and halogen bond networks in cocrystals

Pfrunder, Michael C., Micallef, Aaron S., Rintoul, Llewellyn, Arnold, Dennis P., & McMurtrie, John (2016) Interplay between the supramolecular motifs of polypyridyl metal complexes and halogen bond networks in cocrystals. Crystal Growth & Design, 16(2), pp. 681-695.

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Combining [Ni(phen)3]I2 or [Ni(phen)3]Cl2 (phen = 1,10-phenanthroline) with the iodoperfluorobenzenes (IPFBs), 1,2-, 1,3-, 1,4-diiodotetrafluorobenzene (1,2-, 1,3-, and 1,4-DITFB, respectively), or 1,3,5-triiodotrifluorobenzene (1,3,5-TITFB) resulted in the formation of six different cocrystalline materials featuring halogen-bonded networks encapsulating [Ni(phen)3]2+ ions. The cocrystals have the general formula [Ni(phen)3][(IPFB)n(X2)(L)m]·solvate (n = 2 or 3; X = Cl or I; L = halogen-bonded H2O and/or MeOH; solvate = isolated H2O and/or MeOH). The halide ions balance the charge of the metal complexes and simultaneously act as halogen bond acceptors for the electronically polarized iodine atoms of the IPFB donors. The structures display a wide variety of supramolecular motifs in the context of both the aggregation of the metal complexes and the topology and connectivity of the halogen bond networks. The well-known supramolecular “aryl embrace” motifs of [Ni(phen)3] complexes are present but are structurally compromised to varying degrees in the crystals of [Ni(phen)3][(1,2-DITFB)2I2]·MeOH, [Ni(phen)3][(1,3-DITFB)2I2]·2MeOH, and [Ni(phen)3][(1,3-DITFB)2(H2O)2Cl2]·1.5MeOH. In [Ni(phen)3][(1,3-DITFB)3I2], the [Ni(phen3]2+ complexes are so thoroughly enclosed in halogen-bonded networks that the metal complexes have no significant supramolecular contact. In contrast, in [Ni(phen)3][(1,4-DITFB)3I2(MeOH)0.5] and [Ni(phen)3][(1,3,5-TITFB)2Cl2] the complexes are arranged in typical aryl embrace motifs (pairwise and 1D chains, respectively), but with adjacent complexes held in closer proximity to each other than they reside in crystals of the pure metal complex. The interplay between the supramolecular chemistry of the halogen-bonded networks and the metal complexes was examined in detail, and the results demonstrate that it is possible to significantly influence the aggregation of metal complexes by encapsulation in different halogen bond networks.

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ID Code: 99688
Item Type: Journal Article
Refereed: Yes
Keywords: Halogen bonding, Cocrystals, Polypyridyl metal complexes, Supramolecular chemistry
DOI: 10.1021/acs.cgd.5b01211
ISSN: 1528-7505
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Transition Metal Chemistry (030207)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Nanochemistry and Supramolecular Chemistry (030302)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Facilities: Science and Engineering Centre
Copyright Owner: Copyright 2016 American Chemical Society
Deposited On: 05 Oct 2016 03:44
Last Modified: 11 Oct 2016 04:53

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