A novel one-dimensional zinc coordination polymer containing 4-methylbenzoate and 4,4-bipyridine

Abstract

The title compound, catena-poly[[tris(mu-4-methylbenzoato)-kappa(2)O:O;kappa(4)O:O'-(4-methylbenzoato-kappa(2)O,O')dizinc(II)]-mu-4,4'-bipyridine-kappa(2)N:N'], [Zn(2)(C(8)H(7)O(2))(4)(C(10)H(8)N(2))](n), is a novel coordination polymer. The asymmetric unit contains two unique Zn(II) ions, four 4-methylbenzoate ligands and one 4,4'-bipyridine (4,4'-bpy) ligand, all in general positions. The four 4-methylbenzoate ligands link the two Zn(II) centres to form a dinuclear unit, with a Zn...Zn separation of 3.188 (2) A, which can be regarded as a supramolecular secondary building unit (SBU). These SBUs are further bridged by 4,4'-bpy ligands, forming a novel one-dimensional infinite chain. There are pi-pi stacking interactions between the benzene rings of the 4-methylbenzoate ligands and the pyridyl rings of the 4,4'-bpy ligands, leading to the formation of a corrugated layer. These layers are further assembled via C-H...O hydrogen bonds into a three-dimensional supramolecular network structure. Coordination polymers such as the title compound are of interest for their potential applications as functional materials.

Bis(2,2′-bipyridine-κ2 N,N′)(4-methylbenzoato-κ2 O,O′)copper(II) iodide hemihydrate

“…As a building block, 4-methylbenzoate ligand is an excellent candidate for the construction of supramolecular complexes (Ma & Deng, 2008;Song et al, 2008a,b,c,d). Recently, we obtained the title mononuclear complex by the hydrothermal reaction of CuI, 4-methylbenzoic acid and 2,2′-bipyridine.…”

Drastic steric effects from, respectively, a hydrogen, a methyl and an ethyl group on the coordination network of a zinc(II)–4,4′-bipyridine–carboxylato ternary system

“…Zn2 lies on an inversion centre. The coordination environment around the Zn2 ion is an almost perfect octahedron, since the basal angles, varying from 87.73(13) to 92.27 (13) , are close to the ideal value of 90 . At the basal plane, Zn2 is coordinated by four oxygen atoms (O2, O3, O2c and O3c) from different acetato ligands.…”

“…The distorted octahedral geometry around Zn4 (the basal angles range from 77.31 (13) to 114.80 (18) ) is most likely due to the bite angle of the m-O,O 0 -formato ligands (oxygen atoms O6 and O7), connecting Zn4 to a symmetry-related Zn4 ion (see Fig. 2).…”

“…10 Moreover, the combination of metal-carboxylato building blocks with a secondary co-ligand (usually a dinucleating N-donor ligand, such as 4,4 0 -bipyridine, 4,4 0 -bpy) allows a considerable enhancement of the structural diversity of the coordination materials. 11 Actually, numerous remarkable coordination networks built from 4,4 0 -bpy and carboxylato ligands have been reported in the literature, [12][13][14][15][16][17][18][19] for which the nature of the carboxylato molecule plays an important structural role. [20][21][22][23] In the present study, the effect of the steric hindrance of different carboxylato ligands (formato, acetato and propionato ligands) on the solid-state structure of the corresponding coordination materials has been investigated.…”

Structural diversity in mercury(II) coordination complexes with asymmetrical hydrazone-based ligands derived from pyridine

“…Numerous coordination networks composed of symmetrical ligands, such as bipyridines [11][12][13][14][15] or Shiff-base imino derivatives [16][17][18][19][20][21], have been reported in the literature, where the nature of the organic ligand was shown to have a key role in determining their structure. Over the last few years bis(pyridyl)-2,3-diaza-1,3-butadiene has become a well-known ligating linker in coordination chemistry.…”