In:
Chemistry – A European Journal, Wiley, Vol. 11, No. 17 ( 2005-08-19), p. 5031-5039
Abstract:
A new series of oxovanadium( IV )–lanthanide( III ) heteronuclear complexes [Yb(H 2 O) 8 ] 2 [(VO) 2 (TTHA)] 3 ⋅21 H 2 O ( 1 ), {[Ho(H 2 O) 7 (VO) 2 (TTHA)][(VO) 2 (TTHA)] 0.5 }⋅ 8.5 H 2 O ( 2 ), {[Gd(H 2 O) 7 (VO) 2 (TTHA)][(VO) 2 (TTHA)] 0.5 }⋅8.5 H 2 O ( 3 ), {[Eu(H 2 O) 7 ][(VO) 2 (TTHA)] 1.5 }⋅ 10.5 H 2 O ( 4 ), and [Pr 2 (H 2 O) 6 (SO 4 ) 2 ][(VO) 2 (TTHA)] ( 5 ) (H 6 TTHA=triethylenetetraaminehexaacetic acid) were prepared by using the bulky flexible organic acid H 6 TTHA as structure‐directing agent. X‐ray crystallographic studies reveal that they contain the same [(VO) 2 (TTHA)] 2− unit as building block, but the Ln 3+ ion lies in different coordination environments. Although the lanthanide ions always exhibit similar chemical behavior, the structures of the complexes are not homologous. Compound 1 is composed of a [Yb(H 2 O) 8 ] 3+ ion and a [(VO) 2 (TTHA)] 2− ion. Compounds 2 and 3 are isomorphous; both contain a trinuclear [Ln(H 2 O) 7 (VO) 2 (TTHA)] + (Ln=Ho for 2 and Gd for 3 ) ion and a [(VO) 2 (TTHA)] 2− ion. Compound 4 is an extended one‐dimensional chain, in which each Eu 3+ ion links two [(VO) 2 (TTHA)] 2− ions. For 5 , the structure is further assembled into a three‐dimensional network with an interesting framework topology comprising V 2 Pr 2 and V 4 Pr 2 heterometallic lattices. Moreover, 4 and 5 are the first oxovanadium( IV )–lanthanide( III ) coordination polymers and thus enlarge the realm of 3d–4f complexes. The IR, UV/Vis, and EPR spectra and the magnetic properties of the heterometallic complexes were studied. Notably, 2 shows unusual ferromagnetic interactions between the VO 2+ and Ho 3+ ions.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.200500086
Language:
English
Publisher:
Wiley
Publication Date:
2005
detail.hit.zdb_id:
1478547-X
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