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‐oxoniatricyclo[7.3.1.05,13]tridecane]cobalt(II), [Co(C6H21B6N3O13)] or Co{B6O7(OH)3[O(CH2)2NH2]3}, and the NiII analogue, [Ni(C6H21B6N3O13)], each consist of an MII cation and an inorganic–organic hybrid {B6O7(OH)3[O(CH2)2NH2]3}2− anion. The MII 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.