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The title compound, [(H 3 NCH 2 CH 2 NH 2 )Zn{κ 3  O , O ′, O ′′-B 12 O 18 (OH) 6 -κ 1  O ′′′}Zn(en)(NH 2 CH 2 CH 2 NH 3 )]·8H 2 O (en=1,2-diaminoethane) ( 1 ), was prepared as a crystalline solid in moderate yield from the reaction of B(OH) 3  with [Zn(en) 3 ][OH] 2  in aqueous solution (15:1) ratio. The structure contains a neutral bimetallic complex comprised of a unusual dodecaborate(6−) anion ligating two [H 3 NCH 2 CH 2 NH 2 Zn(en) n ] 3+  centers in a monodentate (n=1) or tridentate (n=0) manner.

pure and applied chemistry

Transition-metal complexes with oxidoborates. Synthesis and XRD characterization of [(H 3 NCH 2 CH 2 NH 2 )Zn{κ 3  O , O ′, O ′′-B 12 O 18 (OH) 6 -κ 1  O ′′′}Zn(en)(NH 2 CH 2 CH 2 NH 3 )]·8H 2 O (en=1,2-diaminoethane): a neutral bimetallic zwiterionic polyborate system containing the ‘isolated’ dodecaborate(6−) anion