The first sodium ion-mediated one-dimensional single-strand helical coordination polymer bridged by tetrafluoroborate

A new sodium tetrafluoroborate bridged neutral helical coordination polymer, formulated as [Na(1,10-phenanthroline)BF4]n, has been synthesized and characterized. X-ray single crystal determination reveals that the Na(I) center has hexa-coordinate distorted octahedron coordination geometry and BF4− anion serves as a multidentate bridging ligand coordinated to three adjacent sodium cations forming an infinite one-dimensional single-strand helix. To the best of our knowledge, the title complex is an unprecedented type of helical structure in which only coordinated alkali metal sodium(I) and bridging tetrafluoroborate are present.