当前位置: X-MOL 学术Inorg. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Competitive Transmetalation of First-Row Transition-Metal Ions between Trinuclear Triple-Stranded Side-by-Side Helicates
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-09-27 00:00:00 , DOI: 10.1021/acs.inorgchem.7b01980
Barun Jana 1 , Luca Cera 2 , Bidyut Akhuli 1 , Sourenjit Naskar 1 , Christoph A. Schalley 2 , Pradyut Ghosh 1
Affiliation  

A hybrid tris-bidentate neutral ligand (L) composed of a central 2,2′-bipyridine and two terminal triazolyl-pyridine chelating units connected by methylene spacers is employed to synthesize trinuclear triple-stranded side-by-side helicates of first-row transition-metal(II) ions. Three such new homometallic helicates L3M3(OTf)6 [ M = Cu2+ (4); Ni2+ (5); Co2+ (6)], along with our recently reported helicates L3Fe3(OTf)6 (1), L3Zn3(OTf)6 (2), and L3Fe2Zn(OTf)6 (3) are taken into consideration for competitive formation and transmetalation studies. Single-crystal X-ray structures of L3Cu3(OTf)6 (4) and L3Ni3(OTf)6 (5) show the formation of trinuclear triple-stranded side-by-side helicates with alternating Λ and Δ chiralities at the metal ions as earlier observed in cases of L3Fe3(OTf)6 (1), L3Zn3(OTf)6 (2), and L3Fe2Zn(OTf)6 (3). ESI-FTICR mass spectrometry and UV–vis spectroscopy studies show that helicates L3Fe3(OTf)6 (1), L3Zn3(OTf)6 (2), L3Fe2Zn(OTf)6 (3), and L3Co3(OTf)6 (6) can easily be transmetalated to helicate L3Cu3(OTf)6 (4) in the presence of Cu(OTf)2. On the other hand, only a trace amount of heterometallic helicate L3Ni2Cu(OTf)6 forms even after several days, when Cu(OTf)2 is added to a the solution of homometallic helicate L3Ni3(OTf)6 (5). Further, we have demonstrated the formation of a heterometallic helicate L3Ni2Co(OTf)6 (7) from a 1:1:1 reaction mixture of L, Ni(OTf)2, and Co(OTf)2, which can also be prepared from homometallic helicate L3Co3(OTf)6 (6) by transmetalation with Ni(OTf)2.

中文翻译:

三核三链并排螺旋分子之间的第一行过渡金属离子的竞争性金属转移

由中央2,2'-联吡啶和两个末端三唑基-吡啶螯合单元(由亚甲基间隔基连接)组成的杂三叉双中性配体(L)用于合成第一行的三核三链并列螺旋过渡金属(II)离子。三个这样的新的同金属螺旋体L 3 M 3(OTf)6 [M = Cu 2+4); Ni 2+5); Co 2+6)],以及我们最近报道的Helicates L 3 Fe 3(OTf)61),L 3 Zn 3(OTf)62)和L 3 Fe 2 Zn(OTf)63)被考虑用于竞争性形成和过渡金属化研究。L 3 Cu 3(OTf)64)和L 3 Ni 3(OTf)65)的单晶X射线结构显示形成了三核三链并列螺旋结构,其中Λ和Δ交替在L 3 Fe 3(OTf)61),L的情况下,金属离子具有手性3 Zn 3(OTf)62)和L 3 Fe 2 Zn(OTf)63)。ESI-FTICR质谱和UV-vis光谱研究表明,L 3 Fe 3(OTf)61),L 3 Zn 3(OTf)62),L 3 Fe 2 Zn(OTf)63)螺旋,并且L 3 Co 3(OTf)66)可以很容易地金属转化为L在Cu(OTf)2的存在下3 Cu 3(OTf)64)。在另一方面,异金属helicate升只有痕量3的Ni 2的Cu(OTF)6点的形式,即使在几天之后,在Cu(OTF)2加入到homometallic helicate L的溶液3的Ni 3(OTF)65)。此外,我们已经证明了由L,Ni(OTf)2的1:1:1反应混合物形成杂金属螺旋盐L 3 Ni 2 Co(OTf)67,和Co(OTf)2,它们也可以由同金属螺旋的L 3 Co 3(OTf)66)通过与Ni(OTf)2的金属转移来制备。
更新日期:2017-09-27
down
wechat
bug