Abstract
Coordination compounds of Cu(II) thenoyltrifluoroacetonate with stable 2-imidazoline nitroxides were synthesized; their structure and magnetic properties were investigated. The complex with a pyrazole nitroxide was isolated as two polymorphous modifications. For both polymorphs, the structure is comprised of Cu(tta)2(NITPz1.3Me) molecules shaped as nearly regular pyramids with four O atoms of the two tta ligands lying at the base. The solid polymorphs are constructed from formal binuclear fragments appearing when the pyramid bases of two neighboring molecules approach each other forming rather short contacts Cu - S (3.848 and 3.596 Å), due to which the polymorphs differ considerably in magnetic properties. In the modification with longer Cu - S distances, there are no exchange interactions between the paramagnetic centers of the neighboring Cu(tta)2(NITPz1.3Me) molecules whereas in the polymorph with shorter Cu - S distances the interactions are significant and analogous to those in real dimer molecules based on the Cu(AcO)2 matrix with a nitroxide.
| Original language | English |
|---|---|
| Pages (from-to) | 1215-1222 |
| Number of pages | 8 |
| Journal | Polyhedron |
| Volume | 20 |
| Issue number | 11-14 |
| DOIs | |
| Publication status | Published - 30 May 2001 |
| Externally published | Yes |
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Keywords
- Copper(II)
- Dimers
- Nitroxide
- Polymorphous modifications
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry
Cite this
Copper(II) thenoyltrifluoroacetonate as acceptor matrix in design of heterospin complexes. / Yeltsov, Ilia; Ovcharenko, Victor; Ikorskii, Vladimir; Romanenko, Galina; Vasilevsky, Sergei.
In: Polyhedron, Vol. 20, No. 11-14, 30.05.2001, p. 1215-1222.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Copper(II) thenoyltrifluoroacetonate as acceptor matrix in design of heterospin complexes
AU - Yeltsov, Ilia
AU - Ovcharenko, Victor
AU - Ikorskii, Vladimir
AU - Romanenko, Galina
AU - Vasilevsky, Sergei
PY - 2001/5/30
Y1 - 2001/5/30
N2 - Coordination compounds of Cu(II) thenoyltrifluoroacetonate with stable 2-imidazoline nitroxides were synthesized; their structure and magnetic properties were investigated. The complex with a pyrazole nitroxide was isolated as two polymorphous modifications. For both polymorphs, the structure is comprised of Cu(tta)2(NITPz1.3Me) molecules shaped as nearly regular pyramids with four O atoms of the two tta ligands lying at the base. The solid polymorphs are constructed from formal binuclear fragments appearing when the pyramid bases of two neighboring molecules approach each other forming rather short contacts Cu - S (3.848 and 3.596 Å), due to which the polymorphs differ considerably in magnetic properties. In the modification with longer Cu - S distances, there are no exchange interactions between the paramagnetic centers of the neighboring Cu(tta)2(NITPz1.3Me) molecules whereas in the polymorph with shorter Cu - S distances the interactions are significant and analogous to those in real dimer molecules based on the Cu(AcO)2 matrix with a nitroxide.
AB - Coordination compounds of Cu(II) thenoyltrifluoroacetonate with stable 2-imidazoline nitroxides were synthesized; their structure and magnetic properties were investigated. The complex with a pyrazole nitroxide was isolated as two polymorphous modifications. For both polymorphs, the structure is comprised of Cu(tta)2(NITPz1.3Me) molecules shaped as nearly regular pyramids with four O atoms of the two tta ligands lying at the base. The solid polymorphs are constructed from formal binuclear fragments appearing when the pyramid bases of two neighboring molecules approach each other forming rather short contacts Cu - S (3.848 and 3.596 Å), due to which the polymorphs differ considerably in magnetic properties. In the modification with longer Cu - S distances, there are no exchange interactions between the paramagnetic centers of the neighboring Cu(tta)2(NITPz1.3Me) molecules whereas in the polymorph with shorter Cu - S distances the interactions are significant and analogous to those in real dimer molecules based on the Cu(AcO)2 matrix with a nitroxide.
KW - Copper(II)
KW - Dimers
KW - Nitroxide
KW - Polymorphous modifications
UR - http://www.scopus.com/inward/record.url?scp=0035972491&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035972491&partnerID=8YFLogxK
U2 - 10.1016/S0277-5387(01)00596-4
DO - 10.1016/S0277-5387(01)00596-4
M3 - Article
VL - 20
SP - 1215
EP - 1222
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
IS - 11-14
ER -