The novel ligand 4′-phenyl-3,2′:6′,3′′-terpyridine ( L) and the supramolecular structure of the dinuclear complex [Zn 2(μ-L)(acac) 4] · H 2O (acac = acetylacetonato)
Inorganic Chemistry Communications (Impact Factor: 1.78). 11/2008; 11(11):1388-1391. DOI: 10.1016/j.inoche.2008.09.009
The new terpyridyl ligand 4′-phenyl-3,2′:6′,3′′-terpyridine (L) reacts with Zn(acac)2 to produce the dizinc complex [Zn2(μ-L)(acac)4]·H2O (1) (acac=acetylacetonato). The analysis of the crystal structure of this zero-dimensional (0D) complex shows the existence of two Zn(acac)2 centers bridged symmetrically by one μ-L ligand. The key role played by the acac and L ligands and the guest water molecule allows the generation of a series of intermolecular hydrogen bonds of the O–H/O, C–H/O and C–H/π type which give raise to a 3D supramolecular array. The observed C–H/π interactions are so widespread that all the π-rings present in the structure, viz., those belonging to the L ligand as well as the acetylacetonato chelate rings, participate as hydrogen bond acceptors.
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ABSTRACT: [Pb(TpyCl)Cl][Pb(TpyCl)Cl2][PbCl3](CH3OH) (1), a new coordination polymer of divalent lead with the ligand 4′-chloro-2,2′:6′,2"-terpyridine (TpyCl), was obtained as single crystals by the branched tube method. The crystal structure contains three complexes, the cationic [Pb(TpyCl)Cl]+, the neutral [Pb(TpyCl)Cl2] and the anionic [PbCl3]–, which are connected through bridging chlorides and hydrogen bonds to a two-dimensional coordination polymer. In all three complexes, the arrangement around the Pb2+ ion suggests the existence of a stereoactive lone pair.
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ABSTRACT: Three new 1:1 complexes of lead(II) with the pincer-type ligand 4′-chloro-2,2′:6′,2″-terpyridine (TpyCl), [Pb(TpyCl)(NO3)2]n(1), [Pb(TpyCl)(ClO4)2]n(2) and [Pb(TpyCl)Br2]2(3), have been synthesized and characterized by X-ray crystal structure determination as well as spectroscopy and thermal analysis. 1 and 2 are coordination polymers in which the coordination polyhedra are linked via nitrate and perchlorate ligands, respectively, to chains. 3 exhibits a dimeric molecular structure with Pb(μ-Br)2Pb type bridging. In all three compounds the chains and the oligomers are connected to networks via supramolecular interactions which include O···O, C–H···O, C–H···Cl and C–H···Br hydrogen bonding and π–π stacking as well.
Article: The relevance of the fluorine interactions in the supramolecular structure of a complex constructed from copper(II) hexafluoroacetylacetonate and the 4′-(3-pyridyl)-2,2′:6′,2″-terpyridine ligand. Novel C–F/π synthons involving the π-system of the terpyridine moieties and those of the hexafluoroacetylacetonate chelate rings[Show abstract] [Hide abstract]
ABSTRACT: Reaction of 4′-(3-pyridyl)-2,2′:6′,2′′-terpyridine (pyterpy) with Cu(hfacac)2 (hfacac=hexafluoroacetylacetonate) led to the formation of the novel compound [Cu3(hfacac)4(μ-pyterpy)2][Cu(hfacac)3]2 (1). The structure is composed of a trinuclear [Cu3(hfacac)4(μ-pyterpy)2]2+ cation and two [Cu(hfacac)3]− anionic species. The cation consists of a chain of three CuII atoms connected by bridging pyterpy ligands. The [Cu(hfacac)3]− anions have the hfacac ligands coordinated in their usual chelating manner through their carbonyl O donors. Besides the coulombian forces, the ionic species are fixed by C–H⋯O, C–H⋯F, F⋯F and a variety of unusual inter-ion C–F⋯π interactions that control the packing motif. These π-interactions involve the terpyridine groups from the pyterpy ligand and the five-membered rings of the chelating hexafluoroacetylacetonate anions.