[Cr(dmbipy)(ox)2]−: a new bis-oxalato building block for metal assembling. Crystal structures and magnetic properties of XPh4[Cr(dmbipy)(ox)2]·5H2O (X = P and As), {Ba(H2O)2[Cr(dmbipy)(ox)2]2}n·17/2nH2O and {Ag(H2O)[Cr(dmbipy)(ox)2]}n·3nH2O
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Altres documents de l'autoria: Viciano Chumillas, Marta; Marino, Nadia; Sorribes, Iván; Vicent Barrera, Cristian; Lloret Pastor, Francesc; Julve, Miguel
Metadades
Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
comunitat-uji-handle4:
INVESTIGACIONMetadades
Títol
[Cr(dmbipy)(ox)2]−: a new bis-oxalato building block for metal assembling. Crystal structures and magnetic properties of XPh4[Cr(dmbipy)(ox)2]·5H2O (X = P and As), {Ba(H2O)2[Cr(dmbipy)(ox)2]2}n·17/2nH2O and {Ag(H2O)[Cr(dmbipy)(ox)2]}n·3nH2OAutoria
Data de publicació
2010Editor
Royal Society of ChemistryISSN
1466-8033Cita bibliogràfica
CrystEngComm (2010) vol. 12, p. 122-133Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.rsc.org/en/content/articlepdf/2010/ce/b914419f?page=searchVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
The synthesis, X-ray structure and variable-temperature magnetic study of new compounds of formula
PPh4
[Cr(dmbipy)(ox)2
]$5H2O (1), AsPh4
[Cr(dmbipy)(ox)2
]$5H2O (2),
{Ba(H2O)2[Cr(dmbipy)(ox)2]2}n$17/2nH2O (3) ... [+]
The synthesis, X-ray structure and variable-temperature magnetic study of new compounds of formula
PPh4
[Cr(dmbipy)(ox)2
]$5H2O (1), AsPh4
[Cr(dmbipy)(ox)2
]$5H2O (2),
{Ba(H2O)2[Cr(dmbipy)(ox)2]2}n$17/2nH2O (3) and {Ag(H2O)[Cr(dmbipy)(ox)2]}n$3nH2O (4) (PPh4
+
¼ tetraphenylphosphonium cation; AsPh4
+
¼ tetraphenylarsonium cation; dmbipy ¼ 4,4
0
-dimethyl-
2,2
0
-bipyridine; ox
2
¼ oxalate dianion) are reported herein. The isomorphous compounds 1 and 2 are
made up of discrete [Cr(dmbipy)(ox)2]
anions, XPh4
+
cations [X ¼ P (1) and As (2)] and uncoordinated
water molecules. The chromium environment in 1 and 2 is distorted octahedral with Cr–O and Cr–N
bond distances varying in the ranges 1.950(2)–1.9782(12) and 2.047(3)–2.0567(14) A˚
, respectively. The
angles subtended at the chromium atom by the two bidentate oxalate ligands cover the range 82.58(10)–
83.11(5)
, and they are somewhat greater than those concerning the chelating dmbipy [79.04(10) (1) and
79.24(5)
(2)]. The [Cr(dmbipy)(ox)2]
unit of 1 and 2 also occurs in 3 and 4 but it adopts different
coordination modes. It acts as a chelating ligand through its two oxalate groups towards the divalent
barium cations in 3 affording neutral chains with diamond-shaped units sharing the barium atoms,
while the two other corners are occupied by two crystallographically independent chromium atoms.
The barium atom in 3 is coordinated by eight oxygen atoms from four oxalate groups and two aqua
ligands. The structure of 4 consists of neutral bimetallic layers where the [Cr(dmbipy)(ox)2]
unit acts as
a ligand towards the univalent silver(I) cation through its two oxalate groups, one of them being
bidentate and the other bidentate/monodentate (outer). Each silver atom is six-coordinated with
a water molecule and five oxygen atoms from three oxalate groups building a highly distorted
octahedral environment. Magnetic susceptibility measurements for 1–4 in the temperature range 1.9–
300 K show the occurrence of weak ferro- (1 and 2) and antiferromagnetic (3 and 4) interactions which
are mediated by p–p stacking between dmbipy ligands through the spin polarization mechanism. A
comparative study of the potentiality of the [Cr(AA)(ox)2]
unit (AA ¼ bidentate nitrogen donor) as
a building blo [-]
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© Royal Society of Chemistry
info:eu-repo/semantics/openAccess
© Royal Society of Chemistry
info:eu-repo/semantics/openAccess
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