Synthesis, Crystal Structure, and Magnetic Properties of a Coordination Polymer [{KMn₄(IDC)₃(prz)}· 3H₂O]_n with 1D Channels

Abstract

A 3D coordination polymer with 1D hexagonal channels of [KMn₄(IDC)₃(prz)· 3H₂O]_n (1) (H₃IDC = imidazole-4,5-dicarboxylic acid, prz = piperazine) was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic with four independent Mn(II) atoms. The IDC^{3 −} anions alternately bridge the Mn(2) and Mn(4) cations to form a 1D infinite linear chain, which is connected by the Mn(1) and Mn(3) through IDC^{3 −} ligands to generate a concertina sheet. The sheets are further interlinked by IDC^{3 −} ligands to form 3D frameworks with 1D hexagonal channels (7.251 × 8.677 Å), which is occupied by water molecules and K⁺ ions. Magnetic susceptibility measurements of 1 exhibit antiferromagnetic interactions between the nearest Mn(II) atoms.

Keywords:

• imidazole-4,5-dicarboxylic acid
• porous
• channel
• magnetism

This work was supported by the National Science Fund for Distinguished Young Scholars of China (20625103), NSFC (20371051).

Notes

^a R = Σ < eqid1 > |F _o | −|F _c < eqid2 > |/Σ |F _o |, wR₂ = [Σ [w(F _o ²− F _c ²)²]/Σ w(F _o ²)²]^1/2; [F _o > 4α(F _o )]

^b Based on all data.