The hexanuclear [Ni6L12](2) wheel-type cluster adopts an unusual structural motif whereby four NiS4 square-planar and two NiS5 square-pyramidal units are conjoined by edge sharing; the NiS5 units resemble the Ni centre of the inactive state in the [NiFe] hydrogenase.
[El-Khawaga, A. M.; El-Zohry, M. F.; Ismail, M. T.; Abdel-Wahab, A. A.; Khalaf, A. A. Phosphorus and Sulfur and the Related Elements, 1987 , vol. 29, p. 265 - 270]