Synthesis and crystal structure of catena-poly[[hexa-aqua{μ₃-2-[bis-(carboxyl-atometh-yl)amino]-terephthalato}dicobalt(II)] penta-hydrate] containing water tapes and penta-mers.

ABSTRACT: The title coordination polymer, {[Co₂(C₁₂H₇NO₈)(H₂O)₆]·5H₂O} _n , was crystallized at room temperature from an aqueous solution of 2-aminodi-acetic terephthalic acid (H₄adtp) and cobalt(II) nitrate. The asymmetric unit consists of one adtp^4- ligand, one and two half Co^II ions, six water ligands coordinated to Co^II ions and five uncoordinated water mol-ecules. Two of the cobalt cations lie on centres of inversion and are coordinated in octa-hedral O₂(OH₂)₄ environments, whereas the other adopts a slightly distorted octa-hedral NO₃(OH₂)₂ environment. The crystal structure contains parallel stacked, one-dimensional zigzag chains, {[Co₂(C₁₂H₇NO₈)(H₂O)₆]} _n , which assemble into a three-dimensional supra-molecular architecture via networks of hydrogen bonds involving the coordinated and free water mol-ecules. One-dimensional 'water tapes' are formed, containing alternating six-membered and twelve-membered rings of water mol-ecules, together with water penta-mers, in which a central uncoordinated water mol-ecule is hydrogen bonded to two coordinated and two free water mol-ecules in a tetra-hedral arrangement.

SUBMITTER: Ma J 

PROVIDER: S-EPMC8423001 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature