Two formate-bridging coordination polymers containing dinuclear zinc(II) macrocyclic components

• Published in: Inorganica Chimica Acta Vol. 342; pp. 9 - 15
• Main Authors: Huang, Wei, Hu, Dahua, Gou, Shaohua, Chantrapromma, Suchada, Fun, Hoong-Kun, Xu, Yan, Meng, Qinjing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10.01.2003
• Subjects: Complexes; Coordination polymers; Crystal structure; Macrocyclic complexes; Zinc complexes; Coordination polymers; Zinc complexes; Complexes; Crystal structure; Macrocyclic complexes
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(02)01135-0

Two coordination polymers ( 2a and 2b) containing dinuclear zinc(II) macrocyclic components have been unexpectedly obtained when pyrazine and 2-methylpyrazine were used to react with dinuclear zinc(II) macrocyclic complexes 1a and 1b, respectively. The X-ray crystal structural study indicated that the coordination environment around each Zn(II) atom in 2 is a five-coordinated distorted pyramid in which the apical position is occupied by a bridging formate anion, unlocalized, in an end to end fashion. The formate group acts as a bidentate bridging ligand to link two adjacent macrocyclic units forming a chain polymer. In addition, H-bonding interactions are observed in the crystal packing of 2a and 2b, which could be described as two-dimensional networks. Two coordination polymers have been unexpectedly obtained when pyrazine and 2-methylpyrazine were used to react with dinuclear zinc(II) macrocyclic complexes. The X-ray crystal structural study indicated that the coordination environment around each Zn(II) atom in 2 is a five-coordinated distorted pyramid in which apical position is occupied by a bridging formate anion, unlocalized, in an end to end fashion. The formate group acts as a bidentate bridging ligand to link two adjacent macrocyclic units forming a chain polymer.