Substituent effect of R-phthalates (R = –CH3, –NO2) on the construction of two novel 2D CuII coordination polymers: Syntheses, crystal structures and magnetic properties

• Two novel coordination polymers have been synthesized and characterized.
• Coordination polymer 1 contains a rarely reported 1D CuII chain.
• Non-coordinated groups of the ligands greatly influence the formations of 1 and 2.
• 1 and 2 exhibit very different antiferromagnetic dominant behaviors.

Two coordination polymers: {[Cu3(MPA)2(trz)(μ3-OH)(H2O)]∙2H2O}n (1) and {[Cu6(NPA)4(trz)2(μ3-OH)2(H2O)2]∙H2O}n (2) (H2MPA = 4-methylphthalic acid, Htrz = 1H-1,2,4-triazole, H2NPA = 4-nitrophthalic acid) were synthesized under identical reaction conditions by changing the non-coordinated methyl group to nitro group of phthalic acid and characterized by elemental analysis, powder X-ray diffraction (PXRD), IR spectrum, thermo-gravimetric (TG) analysis and single crystal X-ray diffraction. Direct-current magnetic susceptibility measurements reveal that relatively strong antiferromagnetic couplings between the CuII spin carriers exist in 1 and 2.

By employing the mixed-linker synthetic strategy, two novel two-dimensional (2D) coordination polymers (1 and 2) were obtained. 1 and 2 exhibit strong antiferromagnetic interactions between CuII carriers.Figure optionsDownload as PowerPoint slide