? 發問時間: 科學化學 · 1 0 年前

請問什麼是”有機化”chelation?

請問什麼是\"有機化\"chelation?

老師問得問題,急!

2 個解答

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  • 1 0 年前
    最佳解答

    會問這種問題的 我相信你的英文有一定的水準啦

    下面是關於有機化學中 chelation的資料

    History

    The term chelate was first applied in 1920 by Sir Gilbert T. Morgan and H. D.

    K. Drew in J. Chem. Soc., 1920, 117, 1456, who stated: "The adjective chelate, derived from the great claw or chele (Greek) of the lobster or other crustaceans, is suggested for the caliperlike groups which function as two associating units and fasten to the central atom so as to produce heterocyclic rings."

    General

    A chelator does not have to be organic. In contrast to the simple monodentate ligands like H2O or NH3, which are easily broken apart by other chemical processes, the polydentate chelators form multiple bonds with the metal ion, resulting in more stable complexes.

    Metal complexes are of widespread interest and studied by inorganic chemists, physical and organic chemists, biochemists, pharmacologists, molecular biologists, and environmentalists.

    Antibiotic drugs of the tetracycline family are also chelators of Ca2+ and Mg2+ ions and are incorporated into bones and teeth.

    In ecology chelation compounds are related to the mobilization of metals in the soil, the uptake and the accumulation of metals into plants and micro-organisms and as a mechanism for resistance and hyperaccumulation adaptations. Such chelation of heavy metals can be used in bioremediation.[1]

    Uses

    Chelators are used in chemical analysis, as water softeners, as preservatives, and in medicine (chelation therapy), where they are employed to safely bind with poisonous metal agents such as mercury, arsenic, or lead to stabilize them and allow them to be excreted without further interaction with the body. Natural chelators include the porphyrin rings in hemoglobin or chlorophyll and the Fe3+ chelating siderophores secreted by microorganisms, and are contained in herbs such as cilantro, which has long been used as a treatment for heavy metal poisoning. A commonly used synthetic chelator is EDTA.

  • 1 0 年前

    歷史

    螯化物這個化學術語在 1920 年首先被吉柏特爵士 T. 摩根和 H. D.

    K. Drew J. Chem 應用,1920,117,1456, 誰陳述:"形容詞螯合(chelate), 從巨大爪或chele (希臘語) 龍蝦或其它甲殼綱被獲得, 被建議為功能作為二個同聯繫在一起的單位和緊固對中央原子的像卡鉗(caliperlike)群組以便生產雜環族化合物的(heterocyclic)環形物。

    2006-06-13 01:48:46 補充:

    一般

    金屬的蛪合劑(chelator) 不必須是有機的。與簡單的monodentate 對比配位體. (ligand)【在配位化合物或錯合物中,與一個中心原子(通常為一金屬元素)相連的任一原子或分子】喜歡H2O 或NH3, 被其它化學過程容易地分開,多牙(polydentate)【可能結合使用二或更多它的施主原子與金屬原子在複合體的配位體 】。金屬的蛪合劑形式多複合結合力與金屬離子, 造成更加穩定的複合體。

    2006-06-13 01:48:57 補充:

    金屬複合體是廣大興趣和由無機化學家學習、物理和有機化學家、生化學家、藥物學家、分子生物學家, 和環境保護者。四環素家庭的抗生素藥物也是 Ca2 的金屬的蛪合劑+ 和 Mg2+ 離子而且被與骨頭和牙齒合併。

    在生態螯合作用化合物與金屬的動員有關在土壤、舉起和金屬的儲積入植物和微生物和作為一個機制為抵抗和hyperaccumulation【高度和有選擇性地積累一個具體元素的現象 】適應。重金屬的這樣的螯合作用可能被使用在生物降解(bioremediation).

    2006-06-13 01:49:28 補充:

    用途

    金屬的蛪合劑被使用在化學分析, 當軟水劑, 作為防腐劑, 和在醫學(螯合作用療法), 他們被安全地使用結合與毒金屬劑,譬如水銀、砷的地方, 或讓他們穩定和使他們沒有進一步互相作用並以身體排泄出去。

    2006-06-13 01:49:38 補充:

    自然金屬的蛪合劑包括紫質環(porphyrin ring)在血紅蛋白或綠葉素裡和Fe3+ 結為螯合物的siderophores【不同的小組低分子重量, 鋼結為螯合物的化合物由微生物生產幫助他們吸收鋼, 重要步驟在劇毒】由微生物藏匿, 而且包含在草本裡,譬如香菜, 長期用來作為治療重金屬毒化。常用的綜合性金屬的蛪合劑是乙二胺四醋酸【(EDTA)ethylenediamine tetraacetic acid或乙二胺四乙酸】

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