C. P. Pradeep, P. S. Zacharias, S. K. Das
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vent water molecule are not located in the difference Fourier maps.
Single crystals of complex 5 were grown by slow evaporation of a
dimethylformamide solution. Unit cell determination and the data
collection were performed on an Enraf–Nonius Mach3 single-crys-
tal diffractometer using graphite-monochromated Mo-Kα radiation
(λ = 0.71073 Å). An empirical absorption correction was applied
to the data based on the ψ-scans of three reflections.[27] Programs
of WinGX[28] were used for data reduction and absorption correc-
tion. The structure was solved by direct methods and refined on F2
by full-matrix least-squares procedures using the SHELX-97 pro-
gram.[25] All the non-hydrogen atoms except the uncoordinated sol-
vent molecules were refined anisotropically. Some benzene rings
show disorder and some restraints were applied. Hydrogen atoms
were not located in association with water molecule oxygen atom.
A high Rint value (0.1510) observed in this case is probably due to
the low diffraction power of the crystal characterized by a large
fraction of weak intensities.
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CCDC-651783 (for 2), -651784 (for 3), -651785 (for 5), and -651786
(for 6) contain the supplementary crystallographic data for this pa-
per. These data can be obtained free of charge from The Cam-
bridge Crystallographic Data Center via www.ccdc.cam.ac.uk/
data_request/cif.
Supporting Information (see also the footnote on the first page of
this article): Detailed synthesis and characterization of the Schiff
bases (ligands) H2L1–H2L6; representative 1H NMR spectrum of
H2L6; representative UV and CD spectra of H2L1; crystal structure
description of the ligand H2L5; additional figures for crystal struc-
tures of the complexes; tables (selected bond lengths and angles)
for compounds 2, 3, 5, and 6; a table for hydrogen-bonding param-
eters for compound 6; a table for summary of electronic spectra
and room temperature magnetic moments for compounds 1–6.
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Acknowledgments
We thank the Department of Science and Technology, Government
of India, for financial support (Project No.: SR/SI/IC-18/2002).
The National X-ray Diffractometer facility at the University of Hy-
derabad by the Department of Science and Technology, Govern-
ment of India, is gratefully acknowledged. We are grateful to Uni-
versity Grants Commitee (UGC), New Delhi, for providing the in-
frastructure facility at the University of Hyderabad under a Univer-
sity with Potential for Excellence grant. C. P. P. thanks University
Grants Commitee (UGC), New Delhi, for a fellowship.
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