优选的过渡金属化合物基于钴和铬，尤其是其具有苯并咪唑配位体的络合物。
Preferred transition metal compounds are based on cobalt and chromium, especially complexes thereof having benzimidazole ligands.
优选的过渡金属化合物基于钴和铬，尤其是其具有苯并咪唑配位体的络合物。
Preferred transition metal compounds are based on cobalt and chromium, especially complexes thereof having benzimidazole ligands.
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