Polymeric structures of a pair of linear, dicarboxylate (tpy)2Ru2+ analogues
摘要:
The preparation and solid-state structures of homoleptic Ru(II) complexes based on the ligands 4'-(4-carboxyphenyl)tpy (L-1) (where tpy = 2,2':6',2"-terpyridine) and 4'-(4-carboxyphenyl)-4,4"-di-(tert-butyl)tpy (L-2) are described. Both complexes are found to possess polymeric solid-state structures due to hydrogen-bonding interactions. The first complex, [Ru(L-1)(2)](2+), exhibits a more closely-packed structure relative to that of [Ru(L-2)(2)](2+), which was found to have a porous solid-state structure due to the steric bulk of the tert-butyl groups. (c) 2007 Elsevier B.V. All rights reserved.
Carboxy-derived (tpy)2Ru2+ complexes as sub-units in supramolecular architectures: The solubilized ligand 4′-(4-carboxyphenyl)-4,4″-di-(tert-butyl)tpy and its homoleptic Ru(II) complex
作者:Michael W. Cooke、Pierre Tremblay、Garry S. Hanan
DOI:10.1016/j.ica.2007.11.032
日期:2008.6
We herein describe the synthesis and characterization of a series of homoleptic, Ru(II) complexes bearing peripheral carboxylic acid functionality based upon the novel ligand 4'-(4-carboxyphenyl)-4,4 ''-di-(tert-butyl)tpy (L-1), as well as 4'-(4-carboxyphenyl) tpy (L-2) and 4'-(carboxy) tpy (L-3) (where tpy = 2,2': 6',2 ''-terpyridine). Inspection of the metal-based oxidations (E-1/2 = 1.22-1.42 V) indicates an anodic shift (similar to 0.2 V) for (L-3)(2)Ru2+ (3b) (E-1/2 = 1.40 V) relative to (L-2)(2)Ru2+ (2b) (E-1/2 = 1.22 V). The metal-based oxidation (E-1/2 = 1.22 V) and ligand-based reductions (E-1/2 = similar to 1.25 to similar to 1.52 V) of (L-1)(2)Ru2+ (1) are essentially invariant relative to those of the structural analogue 2b (PF6)(2), which suggests no significant electronic effect caused by the tert-butyl groups. This is supported by invariance in the metal-to-ligand charge transfer bands in both the electronic absorption (494-489 nm) and emission spectra (654-652 nm). However, contrary to 2b, complex 1 is both very soluble and exhibits a highly porous solid-state structure with internal cavity dimensions of 15 angstrom x 14 angstrom due to the preclusion of inter-annular interactions by the bulky tert-butyl substituents. (C) 2007 Elsevier B. V. All rights reserved.
Polymeric structures of a pair of linear, dicarboxylate (tpy)2Ru2+ analogues
作者:Michael W. Cooke、Pierre M. Tremblay、Garry S. Hanan
DOI:10.1016/j.inoche.2007.08.011
日期:2007.11
The preparation and solid-state structures of homoleptic Ru(II) complexes based on the ligands 4'-(4-carboxyphenyl)tpy (L-1) (where tpy = 2,2':6',2"-terpyridine) and 4'-(4-carboxyphenyl)-4,4"-di-(tert-butyl)tpy (L-2) are described. Both complexes are found to possess polymeric solid-state structures due to hydrogen-bonding interactions. The first complex, [Ru(L-1)(2)](2+), exhibits a more closely-packed structure relative to that of [Ru(L-2)(2)](2+), which was found to have a porous solid-state structure due to the steric bulk of the tert-butyl groups. (c) 2007 Elsevier B.V. All rights reserved.