NDLI: Characterization of heterobimetallic and mixed-valence complexes of molybdenum(V) derived from bis(2-hydroxy-1-naphthaldehyde) malonoyldihydrazone

Content Provider	Springer Nature Link
Author	Kumar, A. Chanu, O. B. Borthakur, R. Lal, R. A.
Copyright Year	2012
Abstract	Heterobimetallic complexes [UO$_{2}$Mo$^{V}$(CH$_{2}$L)(hzd)(H$_{2}$O)$_{2}$]$_{ n }$, [ZnMo$^{V}$(CH$_{2}$L)(hzd)(H$_{2}$O)$_{2}$]$_{ n }$ and mixedvalence complexes [Mo$^{VI}$O$_{2}$Mo$^{V}$(CH$_{2}$L)(hzd)(H$_{2}$O)$_{2}$]$_{ n }$ (where hzdH$_{3}$ = inhH$_{3}$, n = 1; slhH$_{3}$, n = 2) are synthesized from bis(2-hydroxy-1-naphthaldehyde)malonoyldihydrazone (CH$_{2}$LH$_{4}$) and monometallic precursor complexes [Mo(CH$_{2}$LH$_{2}$)(hzd)]·nH$_{2}$O (n = 0, 1) in ethanol. The composition of the complexes is established based on the data obtained from the elemental analysis. The structure of the complexes is discussed in the light of data obtained from molar conductance, magnetic moment, electronic, EPR, and IR spectroscopic studies. All complexes have μB values in the range 1.59–1.64 B.M., slightly lower than that required for one unpaired electron. The heterobimetallic complexes show two bands, while mixed-valence complexes show only one band in the visible region assigned to the d-d transition. The g-values decrease in going from uranyl-to-molybdenyl-to-zinc complexes containing the isonicotinoyldiazenido (inh) group, however, no such regular trend is observed in the case of complexes containing the salicyloyldiazenido (slh) group in the coordination sphere. In all complexes, the principal dihydrazone ligand is present in the enol form as a bridging hexadentate ligand in the anti-cis configuration where hydrazide ligands are coordinated to the metal centre as a trinegative bidentate ligand in the diazenido form.
Starting Page	866
Ending Page	875
Page Count	10
File Format	PDF
ISSN	00224766
Journal	Journal of Structural Chemistry
Volume Number	53
Issue Number	5
e-ISSN	15738779
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-12-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	synthesis characterization molybdenum(V) heterometal hydrazone spectroscopic studies Solid State Physics Atomic, Molecular, Optical and Plasma Physics Physical Chemistry Atomic/Molecular Structure and Spectra Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Physical and Theoretical Chemistry Inorganic Chemistry

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