Structures and dielectric properties of three homonuclear H-bonded 1D chain complexes based on protonated 4,4′-bipyridine-N,N′-dioxide

This paper described three complexes forming 1D chains of Hbp4do+ cations through the bridge of specific short H-bond with different patterns and further develop into multi-dimensional architecture through π⋯π packing. And compound 1 and 2 disclose structure phase transition owing to the disorder-order transition of acid anions.98