کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1334587 | 1500285 | 2013 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Water-soluble bis(4′-[2,2,2-tris(hydroxymethyl)ethoxy]-2,2′:6′,2″-terpyridine)metal complexes Water-soluble bis(4′-[2,2,2-tris(hydroxymethyl)ethoxy]-2,2′:6′,2″-terpyridine)metal complexes](/preview/png/1334587.png)
A series of homoleptic metal complexes containing the pentaerythritol-functionalized ligand 1 (4′-(2,2,2-tris(hydroxymethyl)ethoxy)-2,2′:6′,2″-terpyridine) has been synthesized. In MeOH and under microwave conditions, the 2,2,2-tris(hydroxymethyl)ethoxy substituent is cleaved and replaced by a methoxy group originating from the solvent. This has been confirmed from the single crystal structure of [Zn(2)2][PF6]2 (2 = 4′-methoxy-2,2′:6′,2″-terpyridine). The complexes [Zn(1)2][OAc]2, [Fe(1)2]Cl2 and [Co(1)2][PF6]2 were therefore prepared under mild conditions; [Co(1)2][PF6]2 readily oxidizes to [Co(1)2][PF6]3; the conversion of the paramagnetic [Co(1)2]2+ to diamagnetic [Co(1)2]3+ is readily monitored by 1H NMR spectroscopy. The homoleptic complexes are hygroscopic and are highly soluble in water; the most soluble is [Zn(1)2][OAc]2 (71 mmol dm−3). Structural data for 1, [Zn(1)2][PF6]2, 4{[Zn(1)2][PF6]2}·3MeCN, [Zn(1)(OAc-O)2]·2MeOH and 2{[Co(1)2][PF6]3}·1.5MeCN·1.5H2O confirm that dominant packing forces involve hydrogen bonds between pendant 2,2,2-tris(hydroxymethyl)ethoxy units.
Water-soluble homoleptic complexes with {M(tpy)2} cores and pendant 2,2,2-tris(hydroxymethyl)ethoxy units are reported. Structural data confirm extensive hydrogen bonding involving the pendant functionalities.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 54, 30 April 2013, Pages 110–118