Copper (II) and Palladium (II) Complexes with 1,3-bis-[3-(5-Amino-1,2,4-Triazolyl]triazene and Halogeno (Pseudohalogeno) Ligands: Synthesis and Spectroscopic Characterization

Hanot, V.; Robert, T.; Elst, Luce Vander

doi:10.1080/00945719408001394

Cited by 6 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…C12H,,Cu2Nl,03, M = 531.46, monoclinic, space group P2,/c (no. 14), a = 12.899( 8), b = 6.714 (5), c = 24.286 A, p = 119.98(5)", U = 1822(2) A3 [by least-squares fitting of the setting angles of 11 well centred reflections (SET4 ") in the range 6.2 < 0 < 12.1"; the unit-cell parameters were checked for the presence of higher lattice symmetry'8], T = 150 K, Mo-Ka radiation, h = 0.710 73 A, graphite monochromator,…”

Section: Crystallographymentioning

confidence: 99%

“…In the assembly of the two rigid Cu(bpzt) sub-units, the values of 122.3 (11)' for this angle and of 98.9(7)0 for the N( 132)-Cu( 1 )-N( I3 I a) angle appear to allow a fairly efficient overlap between the copper dX2-,,2 lobe of one sub-unit corresponding to the co-ordination by the outer pyrazole. There is clearly a compromise between this angular strain and respectively * The two crystallographically independent molecules, which 1.911(17) 1.959 (16) are identical within experimental error, are stacked in a 3.852 ( 5 ) staggered way forming columns parallel to the b axis (Fig. 2).…”

Section: Crystallographymentioning

confidence: 99%

See 1 more Smart Citation

Crystal structure, magnetic properties and spectroscopic studies of bis[1,3-bis(pyrazol-3-yl)triazenido]dicopper(II) trihydrate: a dinuclear complex with an asymmetric double pyrazolate bridge

Hanot¹,

Robert²,

Kolnaar³

et al. 1996

J. Chem. Soc., Dalton Trans.

View full text Add to dashboard Cite

The crystal and molecular structure of [{ Cu(bpzt)},]-3H20 [H2bpzt = 1,3-bis(pyrazo1-3-yl)triazene] was determined by X-ray diffraction methods. The complex has a quasi-planar dinuclear structure with an asymmetric double pyrazolate bridge. The asymmetry results from the presence, on the C3 of each bridging pyrazolate, of a pyrazolyltriazenide chelating arm which completes the equatorial CuN, co-ordination. The centrosymmetric dinuclear units have intramolecular Cu 9 Cu distances of 3.852(5) and 3.839(4) A respectively.The units are stacked in columns along the b axis. The cell also contains crossing channels filled with water molecules. The complex was characterized by spectroscopic and magnetic measurements. Magnetic susceptibility data show antiferromagnetic behaviour with an exchange parameter IJI = 15 1 cm-' significantly decreased with respect to symmetric doubly bridged complexes (IJI = ~2 0 0 cm-I). The X-band powder EPR spectrum recorded at 77 K is typical of a triplet spin state lying above the singlet ground state. The results obtained for this complex are compared to recent literature data on other planar doubly bridged pyrazolate dicopper(I1) complexes. A correlation, valid for symmetric as well as asymmetric systems, is described between the exchange parameter J and the deviation of the Cu-N-N bridge angle from the optimum value corresponding to the highest 14.

show abstract

Section: Crystallographymentioning

confidence: 99%