A rational synthesis of ladder-like motif in zinc-methylphosphonate from a preformed coordination assembly

• Published in: Inorganica Chimica Acta 2018-10, Vol.482, p.681-686
• Main Authors: Shankar, Ravi, Mendiratta, Swati, Jakhar, Ekta, Singh, Rohit, Jassal, Amanpreet Kaur, Kociok-Köhn, Gabriele
• Format: Article
• Language: English
• Subjects: Chemical synthesis; Coordination polymers; Crystallography; Ethane; Hydro(solvo)thermal; Hydrogen bonding; Hydrologic analysis; Imidazole; Interlayers; Ladder framework; Ligands; Methylphosphonate; Molecular structure; Phosphonates; Phosphorus; Thermal cycling; Water chemistry; Zinc; Zinc coordination
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2018.07.016

[Display omitted] •A new synthetic method for zinc-methylphosphonates under hydro(solvo)thermal condition is described.•A preformed coordination assembly, zinc bis(O- methyl methylphosphonate) is used as a precursor.•A rational synthesis of ladder-like inorganic framework is achieved by this approach. The study describes the synthesis of new hybrid zinc phosphonates, {Zn(O3PMe)(4,4′-bipy)0.5}·2H2O (2), {Zn(O3PMe)(1,2-bpe)0.5}·H2O (3) and Zn(O3PMe)(Im) (4) [4,4′-bipyridine (4,4′-bipy), 1,2-bis(4-pyridyl)ethane (1,2-bpe) and imidazole (Im)] by hydro(solvo)thermal reaction (140–150 °C, 3 days) of a preformed coordination polymer, zinc bis(O-methyl methylphosphonate), Zn{OP(O)(OMe)Me}2 (1) with an appropriate N-donor ligand. X-ray crystallographic studies reveal structural transformation of a linear chain zinc-phosphonate framework in 1 to a ladder motif in 2–4 which is constructed by corner sharing of ZnO3N and CPO3 tetrahedra. For 2 and 3, the bifunctional N-donor ligands act as linkers to afford the formation of a layered structure. The lattice water molecules in 2 form an infinite array of cyclic tetramers via O–H⋯O2(P) hydrogen bonding interactions and occupy the interlayer region.