In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2011, No. 1 ( 2011-01), p. 39-44
Abstract:
A new N‐heterocyclic carbene ligand N , N ′‐bis(2‐pyridyl)‐tetrahydropyrimidinium hexafluorophosphate ( 1 ) has been synthesized and characterized. Its homoleptic Ru II complex 2 exhibits a more facile oxidation (+1.17 V vs. SCE) relative to the prototypical [Ru(tpy) 2 ] 2+ (+1.32 V vs. SCE) complex (tpy = 2,2′:6′,2″‐terpyridine). The heteroleptic Ru II complex 3 , incorporating 1 and 4′‐ p ‐tolyl‐tpy, also displays a more positive oxidising potential (+1.28 V vs. SCE) than [Ru(tpy) 2 ] 2+ . The X‐ray crystal structures of complexes 2 and 3 confirm the meridional tridentate coordination of ligand 1 to Ru II . The Ru–C bond length is shorter in heteroleptic complex 3 [1.901(7) Å] than in homoleptic complex 2 [1.969(2) Å and 1.972(3) Å]. The complexes display broad metal‐to‐ligand charge‐transfer absorption bands in the visible region ( 2 : λ max = 440 and 470 nm; 3 : λ max = 440 and 473 nm), and their solid‐state emission is redshifted ( 2 : λ max = 753 nm; 3 : λ max = 735 nm) considerably relative to that of [Ru(tpy) 2 ] 2+ ( λ max = 620 nm).
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2011.1
DOI:
10.1002/ejic.201000823
Language:
English
Publisher:
Wiley
Publication Date:
2011
detail.hit.zdb_id:
1475009-0
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