[ L 1 Ni 2 ( CO 2 tBu ) 2 ] , [ L 1 Mg 2 ( CO 2 tBu ) 2 ] , [ L 1 Zn 2 ( CO 2 tBu ) 2 ] , [ L 1 MgZn ( CO 2 tBu ) 2 ] , [ L 1 MgNi ( CO 2 tBu ) 2 ] , [ L 1 Ni 2 ( OPh ) 2 ] , [ L 1 Mg 2 ( OPh ) 2 ] , [ L 1 Zn 2 ( OPh ) 2 ] , [ L 1 MgZn ( OPh ) 2 ] , [ L 1 MgNi ( OPh ) 2 ] ,