Re: [生活] 請問一氧化碳有沒有毒?
※ 引述《tallgeese05 (想要一雙黑色羽翼可以走ꐩ》之銘言:
: ※ 引述《lovelove99 (hi)》之銘言:
: : CO本身沒毒性的
: : 但是它會與O2競爭血紅素Fe2+取代基位置
: : 而且CO鍵結有很強的Anti-bonging的pay back 比O2鍵結強非常多
: 上方這句話是要說所謂的BACK-BONDING的意思嗎?
: 有點看不太懂這句話
: 很強的ANTI-BONDING是說CO上的還是只CO接到Fe+2後和金屬間的anti-bonding?
: 另外 很強的anti-bonding是說軌域的能量比較高還是比較低啊?
: 因為我似乎沒有看過這樣的說法
: 所以想請教一下
根據frontier orbital theory的近似
金屬和CO的作用主要來自於各自的HOMO,LUMO,
以及和HOMO,LUMO能量差不多的幾個orbital,
對於CO來說,主要貢獻的orbital就是HOMO的5sigma以及LUMO的2pi*,
對於金屬來說,主要是d-orbital和s-orbital的貢獻,
而其作用可以細分成兩部分,一部分是CO的5simga donate電子到金屬上,
另一部分是金屬的d-electron back-donating到金屬上,
這邊說CO的back-donating比O2強主要就是在說第二部分的貢獻
強弱的原因大概是來自於CO的2pi*和金屬的d orbital的能量差,比O2和金屬的
來的小,因此back-donating的能力CO會強一點
上面只是根據lovelove99的說法的猜測
有相關文獻關於CO和O2的BACKBONDING的探討嗎?
※ 編輯: kkarthur 來自: 122.117.241.237 (09/10 04:54)
※ 編輯: kkarthur 來自: 122.117.241.237 (09/10 04:55)
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