Journal article
Quinoxaline 1,4-dioxide complexes with 3 d metal perchlorates[1]
Journal of inorganic & nuclear chemistry, v 40(6), pp 1019-1026
1978
Abstract
A series of 3
d metal perchlorate complexes with quinoxaline 1,4-dioxide(L) were synthesized and characterized by means of IR and electronic spectral and magnetic susceptibility (at 297-143 or 80°K) studies. With the exception of a 4:1 LCu(ClO
4)
2 complex, which is apparently monomeric, pentacoordinated of the type [CuL
4(OClO
3)](ClO
4), the spectral and magnetic evidence is in favor of bi- or polynuclear structures, involving terminal (L
t
) and bridging quinoxaline 1,4-dioxide, aqua and unidentate perchlorato ligands, as well as ionic ClO
4
− and lattice water. The magnetic data point to significant spin-spin interactions in these bi- or polynuclear complexes; this is suggestive of coordination of the bridging L groups through only one of their NO oxygens, which acts as a bridge between neighboring metal ions (M
▪M or M(L
b
)
2M bridging) rather than functioning as bidentate, with each of the NO oxygens coordinating to a different metal ion (M(
b
L
b
)M bridges). Proposed structural types are as follows for the binuclear, hexacoordinated new complexes: [(H
2O)(O
3ClO)
2(L
t
)Cr(L
b
)
2Cr(L
t
)(OClO
3)
2(OH
2)](ClO
4)
2·6H
2O; (H
2O)(O
3ClO)(L
t
)
2Fe(L
b
)
2Fe(L
t
)
2(OClO
3)(OH
2)](ClO
4)
4·8H
2O; and [(H
2O)(O
3ClO)(L
t
)
2M(L
b
)
2M(L
t
)
2(OClO
3)(OH
2)](ClO
4)
2· 10H
2O (M = Mn, Fe, Co, Ni, Zn). For a second Cu(II) complex, involving a 3:2 L to Cu ratio, the relatively small μ
eff decrease (0.29 μB) in the 295-82°K range, favors an oligomeric pentacoordinated structure, comprising both possible kinds of bridging L (i.e. characterized by −Cu(L
b
)
2Cu(
b
L
b
)- sequences).
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Details
- Title
- Quinoxaline 1,4-dioxide complexes with 3 d metal perchlorates[1]
- Creators
- D.E. Chasan - GraceL.L. Pytlewski - Drexel UniversityC. Owens - Rutgers, The State University of New JerseyN.M. Karayannis - Amoco
- Publication Details
- Journal of inorganic & nuclear chemistry, v 40(6), pp 1019-1026
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physical Therapy (and Rehabilitation Sciences)
- Web of Science ID
- WOS:A1978FJ73800017
- Scopus ID
- 2-s2.0-0042920632
- Other Identifier
- 991019173641504721