Synthesis and spectroscopic studies on copper(II) binuclear complexes of 1-phenylamidino-O-alkylurea (alkyl = n-propyl, n- and iso-butyl) with 1,3-diaminopropane or ethylenediamine

Inorganic Chemistry

Volumn 45, Issue 5, 2006, Pages 2193-2198

  Pramodini Devi, S ^a   Hemakumar Singh, R K ^a   Kadam, R M ^b  

^a MANIPUR UNIVERSITY   (India)

^b BHABHA ATOMIC RESEARCH CENTRE   (India)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33645067662     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic051037t     Document Type: Article

References (40)

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5. s = 2) at ca. 1600 G, suggesting the formation of binuclear complexes (S = 1). From the observed ZFS, we estimated the average Cu-Cu distance. From the temperature dependence of the EPR signal intensity, we evaluated the isotropic exchange interaction constant J. It appears that the exchange interaction between the two interacting spins of the binuclear complexes is ferromagnetic in nature. The formation of ferromagnetically coupled copper binuclear complexes was further confirmed from the high magnetic-moment values at room temperature. When the EPR spectra were recorded in the temperature range 300-400 K, it was observed that the triplet-state EPR signal completely and irreversibly disappeared at ca. 380 K with the appearance of a new signal attributable to the mononuclear complex (S = 1/2). Thermal studies of these complexes in this temperature range suggested the loss of two water molecules, which might be responsible for binding two mononuclear species. EPR, IR, and thermal studies indicate a long-range ferromagnetic exchange mediated through hydrogen bonding between copper(II) ions (S = 1/2).
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