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https://www.chem-station.com/blog/2013/01/-back-bonding.html
π⊥ back bonding; 逆供与でπ結合が強くなる？! | Chem-Station (ケムステ)
遷移金属錯体中では、金属―配位子間に電子相互作用が見られます。まず、配位子から金属への電子供与にはσ性とπ性のものがあり、中心金属の主に空のｄ軌道へ電子を「供与」します。
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