A new 1-D extended vanadoborate containing triply bridged metal complex units

A new 1-D vanadoborate {[Na(H2O)4]3[V12B18O54(OH)6(H2O)]2}(H4tren)4·(H3O)·41H2O (1, tren = tris(2-aminoethyl)amine) has been hydrothermally synthesized and structurally characterized. 1 consists of 1-D polymeric anions {[Na(H2O)4]3[V12B18O54(OH)6(H2O)]217 −}n, protonated H4tren4 +, H3O+ ions and free H2O molecules. The [V12B18O54(OH)6(H2O)]10 − clusters (denoted on V12B18) are connected by three complex [Na(H2O)4]+ ions as bridges into 1-D chain. 1 is the only example of triply bridged vanadoborate units by three metal complex units. The magnetic susceptibility shows the antiferromagnetic interaction between VIV cations in 1.