請教一題簡單的有機化學

[g880909]

小學都有學過 碘加澱粉會變成藍紫色
請問
有沒有車友可以幫忙寫一下反應方程式
感恩

[JS]

It is a really difficult question, and most details of its mechanism are still unknown.

Iodine anions I(-1) and beta-amylose (one kind of starch) formed iodine-amylose complex, not compound.
Generally, 5 iodine ions reduced (lost) 4 electrons and formed I5(-1) in the coil structure of the amylose molecule.
The iodine-amylose complex absorbs most of visible light. So it looks dark blue.

There is no certain formal formula for this chemical reation.
I try to write down an informal Pig-Head Formula

5I(-1) + (beta)amylose -> I5(-1)-(beta)amylose complex.....

__________________________
JS : Full of Potato Starch in His Stomach and Brain in UK

[g880909]

It is a really difficult question, and most details of its mechanism are still unknown.

Iodine anions I(-1) and beta-amylose (one kind of starch) formed iodine-amylose complex, not compound.
Generally, 5 iodine ions reduced (lost) 4 electrons and formed I5(-1) in the coil structure of the amylose molecule.
The iodine-amylose complex absorbs most of visible light. So it looks dark blue.

There is no certain formal formula for this chemical reation.
I try to write down an informal Pig-Head Formula

5I(-1) + (beta)amylose -> I5(-1)-(beta)amylose complex.....

__________________________
JS : Full of Potato Starch in His Stomach and Brain in UK

Thanks Mate.

[JS]

碘加澱粉會變成藍紫色是常識
但很少人想到為什麼? 要不是實驗室需要, 小弟也不會去想
很好奇為什麼您會問這個問題?

PS1: 並不是所有澱粉加碘都會變成藍紫色
PS2: In(-1), n可以由奇數 3, 5,....15, 一般是 I5
____________________________
腦袋裝滿英國馬鈴薯澱粉 [av] 的 JS

[g880909]

碘加澱粉會變成藍紫色是常識
但很少人想到為什麼? 要不是實驗室需要, 小弟也不會去想
很好奇為什麼您會問這個問題?

PS1: 並不是所有澱粉加碘都會變成藍紫色
PS2: In(-1), n可以由奇數 3, 5,....15, 一般是 I5
____________________________
腦袋裝滿英國馬鈴薯澱粉 [av] 的 JS

如同你說的 實驗室需求
當有時候 一些人的程度沒辦法用常識來說明的時候
只好借用 專業
由於不是學有機 手邊的資料又只找到 碘--澱粉錯合物的資料
深怕有更新的資料
只好求助專業
感謝您提供的資料