title: Structures and multiple properties of two polar metal-organic frameworks based on achiral N,O-coordinated ligands: toward multifunctional materials.
abstract: Two novel metal-organic frameworks (MOFs) [Cd3(padc)(Hpadc)(H2padc)(H2O)]n·nH2O (1, H3padc = pyrazole-3,5-dicarboxylic acid) and [Co4(pidc)2(Hpidc)4(H2O)3]n·12nH2O (2, H2pidc = pyridine-2,5-dicarboxylic acid), that both crystallize in polar space groups, were solvothermally synthesized by using achiral N,O-coordinated ligands. Compound 1 consists of trinuclear Cd(II)-based units that are further bridged by the backbone of H3padc ligands to form a three-dimensional (3-D) (4,6)-connected fsc topology network, while compound 2 features two types of double-helical tubes with different chiralities connecting with each other alternatively to construct a typical 2-D (3,6)-connected kgd topology network. Importantly, 1 exhibits combined properties of photoluminescence (PL) and second harmonic generation (SHG), and represents the first noncentrosymmetric H3padc-based MOF that was obtained without any ancillary ligands. While 2 shows strong antiferromagnetic interactions between paramagnetic Co(II) centers, and the aqueous solution of 2 exhibits effective homogeneous photocatalysis properties under visible irradiation. Further, the mechanisms of the physical properties of 1 and 2 are discussed in detail.
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Guang-Ning
authors.initials: GN
authors.lastname: Liu
authors.affiliation: School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen 518055, P. R. China.
authors.forename: Ming-Jian
authors.initials: MJ
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Wan-Qing
authors.initials: WQ
authors.lastname: Liu
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Sun
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Li
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Cai-Ze
authors.initials: CZ
authors.lastname: Ren
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Zhen-Wei
authors.initials: ZW
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong 250022, P. R. China. chm_liugn@ujn.edu.cn chm_licc@ujn.edu.cn.
authors.forename: Cuncheng
authors.initials: C
authors.lastname: Li