Two new transition metal inorganic–organic hybrid borates: [tris(2‐aminoethoxy)trihydroxyhexaborato]cobalt(II) and its nickel(II) analogue

The two isomorphous title compounds, 1,5,9‐tris(2‐aminoethoxy)‐3,7,11‐trihydroxy‐3,7,11‐tribora‐1,5,9‐triborata‐2,4,6,8,10,12‐hexaoxa‐13‐oxoniatricyclo7.3.1.0^5,13]tridecane]cobalt(II), Co(C₆H₂₁B₆N₃O₁₃)] or Co{B₆O₇(OH)₃O(CH₂)₂NH₂]₃}, and the Ni^II analogue, Ni(C₆H₂₁B₆N₃O₁₃)], each consist of an M^II cation and an inorganic–organic hybrid {B₆O₇(OH)₃O(CH₂)₂NH₂]₃}²⁻ anion. The M^II cation lies on a crystallographic threefold axis (as does one O atom) and is octahedrally coordinated by three N atoms from the organic component. Three O atoms covalently link the B–O cluster and the organic component. Molecules are connected to one another through N—H...O and O—H...O hydrogen bonds, forming a three‐dimensional supramolecular network.