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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Coordination chemistry of [2+2] Schiff-base macrocycles derived from the dianilines [(2-NH2C6H4)(2)X] (X = CH2CH2, O): structural studies and ROP capability towards cyclic esters
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Coordination chemistry of [2+2] Schiff-base macrocycles derived from the dianilines [(2-NH2C6H4)(2)X] (X = CH2CH2, O): structural studies and ROP capability towards cyclic esters

机译:从Dianilines [(2-NH2C6H4)(2)x](X = CH2CH2,O)衍生的[2 + 2] Schiff-Base宏γ的协调化学性:结构研究和对环酯的rOP能力

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摘要

Reaction of the [2 + 2] Schiff-base macrocycles {[2-(OH)-5-(R)-C6H2-1,3-(CH)(2)][CH2CH2(2-C6H4N)(2)]}(2) (R = Me, (LH2)-H-1; tBu, (LH2)-H-2) with FeBr2 afforded the complexes [FeBr((LH2)-H-1)](2)[(FeBr3)(2)O]center dot 2MeCN (1.2MeCN), [FeBr((LH2)-H-2)][X] (X = 0.5(FeBr3)(2)O, 2.0.5MeCN, X = Br, 3.5.5MeCN), respectively. Reaction of (LH2)-H-2 with [KFe(OtBu)(3)(THF)] (formed in situ from FeBr2 and KOtBu), following work-up, led to the isolation of the complex [Fe(L-2)((LH)-H-2)]center dot 3MeCN (4.3MeCN), whilst with [CuBr2] afforded [CuBr((LH2)-H-2)][CuBr2]center dot 2MeCN (5.2MeCN). Attempts to form mixed Co/Ti species by reaction of [CoBrL2][CoBr3(NCMe)] with TiCl4 resulted in [(LH4)-H-2][CoBr4]center dot 2MeCN (6.2MeCN). Use of the related oxy-bridged Schiff-base macrocycles {[2-(OH)-5-(R)-C6H2-1,3-(CH)(2)][O(2-C6H4N)(2)]}(2) (R = Me, (LH2)-H-3; tBu, (LH2)-H-4) with CoBr2 led to the isolation of the complexes [(CoBr)(2)(L-3)]center dot 2C(3)H(6)O (7.2C(3)H(6)O), [Co(NCMe)(2)((LH2)-H-4)][CoBr4]center dot 5MeCN (8.5MeCN), [Co(NCMe)(6)][CoBr3(MeCN)](2)center dot 2MeCN (9.2MeCN). For comparative structural/polymerisation studies, the complexes {CoBr(NCMe)L-5}(2)center dot 2MeCN (10.2MeCN) and [Co(NCMe)(2)L-5](2)[CoBr3(NCMe)](2) (11), [FeBr(NCMe)L-5](2)center dot 2MeCN (12.2MeCN) where (LH)-H-5 = 2,6-(CHO)(2)-4-tBu-C6H2OH, as well as the chelate-free salt [Fe(NCMe)(6)][FeBr3OFeBr3] (13) have been isolated and structurally characterized. The ability of these complexes to act as catalysts for the ring opening polymerisation (ROP) of epsilon-caprolactone (epsilon-CL) and delta-valerolactone (delta-VL) was investigated, as well as co-polymerisation of epsilon-CL with rac-lactide (r-LA) and vice versa.
机译:[2+2]席夫碱大环{[2-(OH)-5-(R)-C6H2-1,3-(CH)(2)][CH2CH2(2-C6H4N)(2)]}(2)(R=Me,(LH2)-H-1;tBu(LH2)-H-2与FeBr2形成配合物[FeBr((LH2)-H-1)](2)[(FeBr3)(2)O]中心点2MeCN(1.2MeCN),[FeBr((LH2)-H-2)][X](X=0.5(FeBr3)(2)O,2.0.5MeCN,X=Br,3.5.5MeCN)。(LH2)-H-2与[KFe(OtBu)(3)(THF)](由FeBr2和KOtBu原位形成)反应后,经过处理,分离出络合物[Fe(L-2)((LH)-H-2)]中心点3MeCN(4.3MeCN),同时与[CuBr2][CuBr2][CuBr2]中心点2MeCN(5.2MeCN)。试图通过[CoBrL2][CoBr3(NCMe)]与TiCl4的反应形成混合的Co/Ti物种,导致[(LH4)-H-2][CoBr4]中心点2MeCN(6.2MeCN)。使用相关的氧桥联希夫碱大环{[2-(OH)-5-(R)-C6H2-1,3-(CH)(2)][O(2-C6H4N)(2)]}(2)(R=Me,(LH2)-H-3;tBu(LH2)-H-4与CoBr2的作用导致了配合物[(CoBr)(2)(L-3)]中心点2C(3)H(6)O(7.2C(3)H(6)O),[Co(NCMe)(2)((LH2)-H-4)][CoBr4]中心点5MeCN(8.5MeCN),[Co(NCMe)(6)][CoBr3(MeCN)](2)中心点2MeCN(9.2MeCN)的分离。对于比较结构/聚合研究,分离并表征了配合物{CoBr(NCMe)L-5}(2)中心点2MeCN(10.2MeCN)和[Co(NCMe)(2)L-5](2)[CoBr3(NCMe)](2)(11),[FeBr(NCMe)L-5](2)中心点2MeCN(12.2MeCN),其中(LH)-H-5=2,6-(CHO)(2)-4-tBu-C6H2OH,以及无螯合盐[Fe(NCMe)(6)][FeBr3OFeBr3](NCMe)(13)。研究了这些配合物作为epsilon己内酯(epsilon CL)和delta戊内酯(delta VL)开环聚合(ROP)催化剂的能力,以及epsilon CL与rac丙交酯(r-LA)的共聚合,反之亦然。

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