title: Heteronuclear complexes of macrocyclic oxamide with co-ligands: syntheses, crystal structures, and magnetic properties.
abstract: Four heteronuclear complexes Mn(CuL)2(SCN)2 (1), {[Mn(CuL)2(mu-dca)2].2H2O}n (2), Zn(CuL)2(SCN)2 (3), and [Fe(CuL)(N3)2]2 (4) incorporating macrocyclic oxamide ligands have been synthesized and structurally characterized. L is the dianion of diethyl 5,6,7,8,15,16-hexahydro-6,7-dioxodibenzo[1,4,8,11]-tetraazacyclotetradecine-13,18-dicarboxylate, and dca is the dicyanamide. The structure of 1 or 3 consists of oxamido-bridged trinuclear [MIICuII2] molecules (for 1, M is the manganese(II) ion, and for 3, M is the zinc(II) ion). Both of them consist of 1D supramolecuar chains via pi-pi interactions. The structure of 2 also has the oxamido-bridged trinuclear [MnIICuII2] structure units and consists of 2D layers formed by the linkage of copper(II) and manganese(II) atoms via the oxamido and mu1, 5-dca bridges. Complex 4 consists of oxamido-bridged tetranuclear [FeII2CuII2] molecules and arranges in 1D chains. Different co-ligands may result in different structures in this macrocyclic oxamide system. The variable-temperature magnetic susceptibility measurements (2-300 K) of 1 and 2 both show the pronounced antiferromagnetic interactions between the copper(II) and manganese(II) ions.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Zhu
authors.forename: Na
authors.initials: N
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Dai-Zheng
authors.initials: DZ
authors.lastname: Liao
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yoshimura
authors.forename: Ko
authors.initials: K
authors.lastname: Mibu
authors.forename: Zong-Hui
authors.initials: ZH
authors.lastname: Jiang
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007501:Iron / Q000737:chemistry*; D008024:Ligands; D047028:Macrocyclic Compounds / Q000138:chemical synthesis*; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D010072:Oxamic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013696:Temperature; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; D047028:Macrocyclic Compounds; D009942:Organometallic Compounds; D008345:Manganese; D003300:Copper; D007501:Iron; D015032:Zinc; D010072:Oxamic Acid; C008728:oxamide