Title

含硒或碲之鉻金屬羰基化合物的系統研究

Translated Titles

Synthesis and Characterization of Group 6 (M= Cr, Mo) Carbonyl Chalcogenides Complexes

Authors

何莉芳

Key Words

團簇化合物 ; 羰基 ; cluster ; carbonyl

PublicationName

臺灣師範大學化學系學位論文

Volume or Term/Year and Month of Publication

1999年

Academic Degree Category

碩士

Advisor

謝明惠

Content Language

繁體中文

Chinese Abstract

[1] 硒(Se)-鉻(Cr)系統的研究 使用Se金屬粉末或是其氧化物(Na2SeO3、SeO2),與Cr(CO)6、Et4NBr,以1:2的比例在鹼性甲醇溶液中,加熱反應可得雙三角錐結構的[Et4N]2[Se2Cr3(CO)10]。利用相同條件,[S2Cr3(CO)10]2-亦可成功地被合成出。 將[Se2Cr3(CO)10]2-與MeOTf反應,可得單甲基及雙甲基化合物[MeSeCr3(CO)15]-、{MeSeCr(CO)4}2,並探討兩化合物之間的關係。然而,與其他有機試劑RX (R = C3H3, X = Cl, Br; R = CH3, X = I) 反應,則僅得穩定的單核產物[XCr(CO)5]-(X = Cl、Br、I)。 此外,與第八族的異核金屬Fe(CO)5、Ru3(CO)12反應,分別得已知產物[SeFe3(CO)9]2-與具八面體結構的[HSe2Ru4(m-CO)2(CO)8]-、[Se2Ru4(m-CO)4(CO)8]2-。而將[Se2Cr3(CO)10]2-與1當量的Mo(CO)6在丙酮中反應,可得混合鉻鉬金屬的化合物 [Se2MoCr2(CO)10]2-;若以過量的Mo(CO)6反應,則得高產率完全取代的[Se2Mo3(CO)10]2- 。 至於[Se2Cr3(CO)10]2-與 Mn(CO)5Br的反應在丙酮中反應,可得兩種不同形式且結構特殊的混合鉻-錳金屬化合物,分別是 [Me2CSe2Cr2Mn(CO)14]-與[ Se2Cr2Mn3(CO)20]-。 [2] 碲(Te)-鉻(Cr)系統的研究 將Te與Cr(CO)6、KOH以1:2的比例在甲醇溶液中反應,先形成[HTe{Cr(CO)5}2]-,但目前並無證據顯示其存在,再加入Et4NBr則可得綠色不安定化合物[Te{Cr(CO)5}2]2-。然而當我們改用鹼度較小的NaOH,依相同條件則得單甲基化合物[MeTe{Cr(CO)5}2]-,推測甲基是來自所使用的溶劑MeOH。若以[Te{Cr(CO)5}2]2-與MeOTf反應,僅生成雙甲基化合物Me2Te{Cr(CO)5}2。 此外,[Te{Cr(CO)5}2]2-對O2、CH2Cl2極為敏感,會迅速反應生成雙聚合的[L{TeCr2(CO)10}2]2- (L = O, CH2)。 [Te{Cr(CO)5}2]2-再進一步與Cu(CH3CN)4BF4反應,可得已知平面型化合物[Te2Cr4(CO)20]2-。若改與NaOH/MeOH反應,則生成另一已知開放性結構的化合物[Te2Cr4(CO)18]2-。 至於,提高Cr(CO)6的比例至1:3,所得產物亦很容易與CH2Cl2反應,而生成[CH2ClTe{Cr(CO)5}3]-。 [3] 碲(Te)-鉬(Mo)系統的研究 使用Te powder 與 Mo(CO)6 在鹼性甲醇溶液中反應,可得車輪狀化合物 [Te8Mo6(CO)18]2-,此化合物包含三個Te2Mo2平面並以Te22-相連結 ,故亦可由[Te2Mo4(CO)18]2-與Te/KOH反應而得 。若將[Te2Mo4(CO)18]2- 與溴丙烯 H2C=CHCH2Br反應,丙烯基取代起始物中的Mo(CO)5,而生成雙取代化合物[(C3H5)2Te2Mo2(CO)6] 。

English Abstract

[1] Se-Cr system Reflux of Se powder or SeO2、SeO32- with Cr(CO)6、Et4NBr in KOH/MeOH solution yields the closo-cluster [Et4N]2[Se2Cr3(CO)10]. [S2Cr3(CO)10]2- also an be prepared in the similar conditions. Further methylation of [Se2Cr3(CO)10]2- with MeSO3CF3 produces the selenium-methylated complex [MeSe{Cr(CO)5}3]- and {MeSeCr(CO)4}2 . However, the reactions of [Se2Cr3(CO)10]2- with RX (R = C3H3, X = Cl, Br; R = CH3, X = I) form the known mononuclear compounds [XCr(CO)5]- (X = Cl, Br, I) Further, reaction of [Se2Cr3(CO)10]2- with Fe(CO)5/KOH gives [SeFe3(CO)9]2-, while treatment with Ru3(CO)12 produces the octahedral complexes [HSe2Ru4(m-CO)2(CO)8]- and [Se2Ru4(m-CO)4(CO)8]2-. Be- sides, [Se2Cr3(CO)10]2- can react with 1 equiv. of Mo(CO)6 in acetone to produce the mixed-metal Cr/Mo cluster [Se2MoCr2(CO)10]2-. On the other hand, reaction of [Se2Cr3(CO)10]2- with excess Mo(CO)6 leads to formation of [Se2Mo3(CO)10]2- in good yield. When [Se2Cr3(CO)10]2- was treated with Mn(CO)5Br in acetone at room temperature, two different types of the unusual mixed-metal clusters [Me2CSe2Cr2Mn(CO)14]- and [Se2Cr2Mn3- (CO)20]- were produced. [2] Te-Cr system The reaction of Te powder with Cr(CO)6/KOH in a molar ratio of 1:2 in methanol solution forms [HTe{Cr(CO)5}2]- , which can rapidly transform into a highly reactive species [Et4N]2[Te{Cr(CO)5}2] by the addition of Et4NBr . However, the mono-methylated complex [MeTe{Cr(CO)5}2]- can be obtained by using NaOH under the similar conditions, where the methyl group is likely to come from the methanol solvent. The reaction of [Te{Cr(CO)5}2]2- with MeSO3CF3 only affords the double-methylated complex Me2Te{Cr(CO)5}2 . [Te{Cr(CO)5}2]2- rapidly transforms to give [X{TeCr2(CO)10}2]2- (X = O, CH2) upon the attack of O2 and CH2Cl2. Besides, the reaction of [Te{Cr(CO)5}2]2- with Cu(CH3CN)4BF4 produces the known compound [Te2Cr4(CO)20]2- while treatment of [Te{Cr(CO)5}2]2- with NaOH/MeOH gives another known compound [Te2Cr4(CO)18]2-. When Te powder reacts with Cr(CO)6/KOH in a molar ratio of 1: 3 in methanol solution, the product is found to rapidly transform into a new complex [CH2ClTe{Cr(CO)5}3]- upon the addition of CH2Cl2. [3] Te-Mo system Reflux of Te powder and Mo(CO)6 in KOH/MeOH solution forms the tire-shaped cluster [Te8Mo6(CO)18]2-, which contains three Te2Mo2 planes linking by Te22- group. This product can be also obtained from the reaction of Te powder with [Te2Mo4(CO)18]2- in the basic alcoholic solution. When [Te2Mo4(CO)18]2- was treated with H2C=CHCH2Br, the double-substituted complex [(C3H5)2Te2Mo2(CO)6] was obtained where the Mo(CO)5 moiety of [Te2Mo4(CO)18]2- is replaced by the incoming C3H5 group. The study herein describes the similarities and differences among the reactions of group 6 (Cr, Mo) carbonyls with group 16 chalcogen atoms (S, Se, Te) and discusses as well the effect of basicity and metal size on cluster formation.

Topic Category 基礎與應用科學 > 化學
理學院 > 化學系
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