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Abstract
The asymmetric unit of the polymeric title compound {[Co2(C12H7NO8)(H2O)2]·1.6H2O} n comprises two CoII ions, which are coordinated by fully deprotonated 2-aminodi-acetic terephthalic acid (adtp4-) and terminal water mol-ecules in distorted octa-hedral N1O5 and O6 coordination environments. The title compound features tetra-nuclear CoII units bridged by κ 3 O:O:O'- and κ 3 O:O,O'-carboxyl-ate groups, which are joined into ribbons via syn-anti carboxyl-ate bridges. The parallel adtp4- ligands with an alternately reversed arrangement further link adjacent CoII ribbons into (010) layers, which are assembled into a three-dimensional supra-molecular network via inter-molecular hydrogen bonds. The disordered water solvent mol-ecules are situated in channels parallel to [100]. Magnetic measurements and analyses reveal that the title compound displays anti-ferromagnetic behaviour. The purity of the title compound was characterized by X-ray powder diffraction.
Highlights
The asymmetric unit of the polymeric title compound {[Co2(C12H7NO8)(H2O)2]Á1.6H2O}n comprises two CoII ions, which are coordinated by fully deprotonated 2-aminodiacetic terephthalic acid and terminal water molecules in distorted octahedral N1O5 and O6 coordination environments
The title compound features tetranuclear CoII units bridged by 3O:O:O0- and 3O:O,O0-carboxylate groups, which are joined into ribbons via syn–anti carboxylate bridges
Immense efforts have been devoted to the construction of coordination polymers (CPs) for successful predictions and the rational design of definite structures; many significant advances in the construction of CPs have occurred by employing well-defined rigid multicarboxylic acids (Padial et al, 2020; Li et al, 2020b; Wang et al, 2019a; Shen et al, 2017; Pang et al, 2017)
Summary
Over the last two decades, coordination polymers (CPs) have become one of the most attractive fields in chemistry because of their fascinating structures and promising applications as solid functional materials in adsorption and separation (Gan et al, 2020; Yang et al, 2020; Qian et al, 2020; Islamoglu et al, 2020), catalysis (Bavykina et al, 2020), sensing (Allendorf et al, 2020), luminescence (Rice et al, 2020) and magnetism (Thorarinsdottir & Harris, 2020; Wang et al, 2019b). The adip4– ligand chelates Co1 with the amino nitrogen atom (N1) and carboxylate oxygen atoms (O1, O5 and O7) from the aminodiacetate moiety and its ortho-positioned carboxylate group. The ortho-positioned carboxylate group (O1iii and O2iii) from another adip4– ligand chelates Co2, two cis-related positions of which are occupied by two aminodiacetate oxygen atoms (O8iv and O6) from two different adip4– ligands. Carboxylate groups from the aminodiacetate moieties and ortho-positioned 3O:O,O0-carboxylate groups (Li et al., 2020a; Zhang et al, 2019a,b; Liu et al, 2018), wherein two equivalent 2-oxygen atoms (O7 and O7i) from 3O:O:O0carboxylate groups doubly bridge Co1 and Co1ii into a dinuclear unit. Parallel-aligned adtp4– ligands with an alternately reversed arrangement bind adjacent CoII ribbons into a layer extending parallel to (010) (Fig. 3)
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