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Although small cyclic‐ and open‐chain unsaturated hydrocarbon anions such as cyclopentadienide and open‐chain pentadienide are used as the strongly electron‐donating auxiliary ligands for metal complexes, more extended π‐conjugated unsaturated hydrocarbon anions have rarely been used in coordination chemistry, despite their potential ability to serve as the multiply bridging π‐ligands for metal clusters...
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