Design of Kagome Strip Crystals: Directing Role of Hydroxide versus Fluoride in A 2 M 3 ( X O 4 ) 2 ( Y ) 2 ( A = Na + , K + ; M = Mn 2+ , Co 2+ , Ni 2+ ; X = P 5+ , As 5+ , V 5+ ; Y = (OH) − , F – )

Kagome strip phases are potential quantum materials due to their complex magnetic interactions that can be traced to their hybrid one-dimensional (1D) and two-dimensional (2D) structural motifs. Using a high-temperature hydrothermal method, the designed synthesis and crystal growth of a broad general class of Kagome strip materials with the formula A 2 M 3 ( X O 4 ) 2 (OH) 2, where M is a range of divalent transition metal ions with differing spin values, are reported herein. An attempt to replace hydroxide with fluoride led to Na 2 M 3 (PO 4 ) 2 F 2 in a new structure type with 1D chains of half-delta transition metal arrangements. In both cases, the crystals were grown large enough to align in an external magnetic field, enabling future studies of their anisotropic magnetic properties. The structures are compared to one another with analysis of the importance of hydrogen bonding in the structure formation to enable future design of magnetically frustrated crystals.