Structural assemblies of four Cd(II) coordination polymers based on 5-methylisophthalic acid

Abstract Four new metal-organic coordination polymers, Cd(mip)(DMF)( 1 ), Cd(mip)(EtOH)( 2 ), Cd 2 (mip) 2 (H 2 O) 5 ·3H 2 O ( 3 ), Cd(mip)(bpp)(H 2 O)·H 2 O ( 4 ) (H 2 mip = 5-methylisophthalic acid, bpp = 1,3-di(4-pyridyl)propane) have been hydro(solvo)thermally synthesized and characterized by IR, thermogravimetric (TG) analysis, powder X-ray diffraction and single-crystal X-ray diffraction. 1 and 2 are isostructural, and two adjacent Cd centers are bridged by four carboxylate groups in μ 2 -carboxylato-κ 1 O . :κ 1 O′ and μ 2 Ο; κ 2 O,O′ fashion to form a linear (Cd–O–Cd) n chain. The adjacent (Cd–O–Cd) n chains are further connected by mip bridges to form a 3D framework. 3 features two types of chiral layers: One left-handed and another right-handed, which lead to racemic solid-state compound. 4 exhibits a two-dimensional wave-like (2D) (4,4) layer structure with infinite 1D linear chain. In addition, the luminescent properties of 1 – 4 are also discussed.