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Syntheses and structures of three macrocyclic supramolecular complexes and one Zn II -containing coordination polymer generated from a semi-rigid multidentate N-containing ligand

Niu, Xiang-Long ; Wei, Lin ; Liu, Jian-Cheng ; [et al.]

International Union of Crystallography (IUCr) ; 2021

In: Acta Crystallographica Section C Structural Chemistry Vol. 77, No. 1 ( 2021-01-01), p. 29-39

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In: Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr), Vol. 77, No. 1 ( 2021-01-01), p. 29-39

Abstract: Semirigid organic ligands can adopt different conformations to construct coordination polymers with more diverse structures when compared to those constructed from rigid ligands. A new asymmetric semirigid organic ligand, 4-{2-[(pyridin-3-yl)methyl]-2 H -tetrazol-5-yl}pyridine ( L ), has been prepared and used to synthesize three bimetallic macrocyclic complexes and one coordination polymer, namely, bis(μ-4-{2-[(pyridin-3-yl)methyl]-2 H -tetrazol-5-yl}pyridine)bis[dichloridozinc(II)] dichloromethane disolvate, [Zn 2 Cl 4 (C 12 H 10 N 6 ) 2 ]·2CH 2 Cl 2 , ( I ), the analogous chloroform monosolvate, [Zn 2 Cl 4 (C 12 H 10 N 6 ) 2 ]·CHCl 3 , ( II ), bis(μ-4-{2-[(pyridin-3-yl)methyl]-2 H -tetrazol-5-yl}pyridine)bis[diiodidozinc(II)] dichloromethane disolvate, [Zn 2 I 4 (C 12 H 10 N 6 ) 2 ]·2CH 2 Cl 2 , ( III ), and catena -poly[[[diiodidozinc(II)]-μ-4-{2-[(pyridin-3-yl)methyl] -2 H -tetrazol-5-yl}pyridine] chloroform monosolvate] , {[ZnI 2 (C 12 H 10 N 6 )]·CHCl 3 } n , ( IV ), by solution reaction with Zn X 2 ( X = Cl and I) in a CH 2 Cl 2 /CH 3 OH or CHCl 3 /CH 3 OH mixed solvent system at room temperature. Complex ( I ) is isomorphic with complex ( III ) and has a bimetallic ring possessing similar coordination environments for both of the Zn II cations. Although complex ( II ) also contains a bimetallic ring, the two Zn II cations have different coordination environments. Under the influence of the I − anion and guest CHCl 3 molecule, complex ( IV ) displays a significantly different structure with respect to complexes ( I )–( III ). C—H...Cl and C—H...N hydrogen bonds, and π–π stacking or C—Cl...π interactions exist in complexes ( I )–( IV ), and these weak interactions play an important role in the three-dimensional structures of ( I )–( IV ) in the solid state. In addition, the fluorescence properties of L and complexes ( I )–( IV ) were investigated.

Type of Medium: Online Resource

ISSN: 2053-2296

URL: Article