Magnetic and spectroscopic behaviour of copper(II) complexes of 5-substituted 2-salicylidenebiguanides

Bera, Jaharlal L.; Pramanik, Panchanan; Sen, D. N.

doi:10.1039/dt9750002436

Cited by 4 publications

(1 citation statement)

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“…In the case of oxygen-bridged trimeric copper(II) complexes which have no central OH~ or Obridge, the magnitude of the J values is in the range -79 to -318 cm-1 [24,34]. In the title compound, the magnitude of the coupling constant is in this range.…”

Section: Magnetic Propertiesmentioning

confidence: 98%

Crystal Structure and Magnetic Properties of an Oxygen-Bridged Trinuclear Copper(II) Complex

Elerman

Kavlakoglu

Elmalı

et al. 2001

Zeitschrift Für Naturforschung B

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Trinuclear Copper(II) Complex, Super-Exchange Interactions, Antiferromagnetic Coupling[Cu, (L)3].3(C1C>4) (LH = l,3-diaminopropan-2-ol) was synthesized and its crystal structure determined. It crystallizes in the triclinic space group P I with a = 10.504(2), b = 10.856(2), c = 12.519(2) A, a = 74.41(1), ß = 70.60(1), 7 = 63.60(1)°, V = 1193.6(3) A3, Z = 2. The structure consists of trimeric [Cu3(L)3]+3 units and three perchlorate anions in the asymmetric unit. In the compound three copper(II) ions are linked by l,3-diamino-2-propanol molecules in such a way that an almost equilateral triangle is formed. The coordination spheres of the three copper(II) ions are slightly different from each other. The coordination geometry of Cul is a distorted square pyramid, and that of Cu2 is almost square planar while that of Cu3 is tetrahedrally distorted square planar. The copper(II) centers are separated by average 3.481(2) A and antiferromagnetically coupled (-J = 100 cm-1), which follows from temperature-dependent magnetic susceptibility measurements in the temperature range 4.4 to 299 K. The average Cu-O-Cu angle is 128.1(1)° in the super-exchange pathway. As the temperature is increased, the magnetic moment rises from 1.41 ^b at 4.4 K to 2.22 ^b at 299 K. In the \(T ) curve no characteristic maximum was observed. The magnetic super-exchange interaction for the title compound is due to the effective overlap of the magnetic orbitals (dx2 _y2) with orbitals of bridging alkoxide oxygen atoms

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Section: Magnetic Propertiesmentioning

confidence: 98%

Crystal Structure and Magnetic Properties of an Oxygen-Bridged Trinuclear Copper(II) Complex

Elerman

Kavlakoglu

Elmalı

et al. 2001

Zeitschrift Für Naturforschung B

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ChemInform Abstract: MAGNETIC AND SPECTROSCOPIC BEHAVIOR OF COPPER(II) COMPLEXES OF 5‐SUBSTITUTED 2‐SALICYLIDENEBIGUANIDES

Bera¹,

Pramanik²,

Sen³

1976

Chemischer Informationsdienst

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Dimeric tetrahedral complexes of manganese(II) and iron(II) with benzoyl hydrazones

Rastogi

Sahni

Rana

et al. 1978

Transition Met Chem

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SummaryDimeric manganese(ll and iron(ll) complexes, (ML)2, derived from benzoyl hydrazones of o-hydroxyaryl aldehydes and ketones are described and characterised by elemental analyses and by conductance, molecular weight, magnetic, electronic and i.r. spectral measurements. The dimeric nature of the complexes is revealed by i.r. spectra which show bands at ca. 885 Mn 2÷and 820cm -* Fe 2 +, characteristic of O M a+/ ~ M ~* ring vibrations. The i.r. spectra reveal the terdentate nature of the ligands. The electronic spectra in dimethylformamide are consistent with the tetrahedral nature of the complexes. The appreciable lowering in ~eff is attributed to the presence of exchange interactions between two paramagnetic atoms via oxygen bridges.

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Magnetic and spectroscopic behaviour of copper(II) complexes of 5-substituted 2-salicylidenebiguanides

Cited by 4 publications

References 0 publications

Crystal Structure and Magnetic Properties of an Oxygen-Bridged Trinuclear Copper(II) Complex

Crystal Structure and Magnetic Properties of an Oxygen-Bridged Trinuclear Copper(II) Complex

ChemInform Abstract: MAGNETIC AND SPECTROSCOPIC BEHAVIOR OF COPPER(II) COMPLEXES OF 5‐SUBSTITUTED 2‐SALICYLIDENEBIGUANIDES

Dimeric tetrahedral complexes of manganese(II) and iron(II) with benzoyl hydrazones

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