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| METALLOCENE | MOLECULE | GEOMETRY | MOLECULAR ORBITALS | VIBRATIONS | BOND ORDER |
| SANDWICH STRUCTURE | Staggered | (C4H4)2Ni | |||
| Eclipsed | (C4H4)2Ni | (C4H4)2Ni | |||
| HALF-SANDWICHES | (C4H4)Ni | ||||
| |
(C4H4)Ni(CO)2 | (C4H4)Ni(CO)2 | |||
| (C4H4)Ni(CO) | |||||
| BENT SANDWICHES | |||||