Self-assembled Transition Metal Coordination Frameworks of ...

1.6.4. IR spectra
_ __g W ___ M Introduction
Infrared spectra of organic ligands and their metal complexes in the range
4000-400 cm'1 were recorded on a Thermo Nicolet, Avatar 370 .DTGS model FT-IR
spectrophotometer with KBr pellets and ATR technique at SAIF, Kochi. The far IR
spectra of metal complexes were recorded using polyethylene pellets in the 500-100
cm" region on a Nicolet Magna 550 FTIR instrument at the Sophisticated Analytical
Instrumentation Facility, Indian Institute of Technology, Bombay, India.
1.6.5. Single crystal X-ray crystallography
The technique of single crystal X-ray crystallography is used to determine the
arrangement of atoms within a crystal, which provides positions of atoms very
precisely. This has led to a better understanding of chemical bonds and non-covalent
interactions. The first atomic-resolution structure to be solved (in 1913) was that of
table salt [88], which proved the existence of ionic compounds and that crystals are
not necessarily comprised of molecules. X-Ray crystallography had a pioneering role
in the development of supramolecular chemistry, particularly in clarifying the
structures of the crown ethers and the principles of host-guest chemistry. As of 1“
January 2007 the Cambridge Structural Database (C SD), the principal product of the
Cambridge Crystallographic Data Centre (CCDC) contains 400977 structures [89].
The crystallographic data of present work were collected at (i) the X-ray
Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang,
Malaysia, (ii) the Analytical Sciences Division, Central Salt and Marine Chemicals
Research Institute, Bhavnagar, Gujarat, India, (iii) the Department of Inorganic and
Physical Chemistry, Indian Institute of Science, Bangalore, India and (iv) the National
Single Crystal X-ray Diffraction Facility, Indian Institute of Technology, Bombay,
India.
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