title: Growth and characterisation of a new polymorph of barium maleate: a metal organic framework.
abstract: A new polymorph of barium maleate (BM) with chemical formula C24H14O24Ba5⋅7H2O is grown by modified gel method. Transparent plate like crystals of dimensions 9×4×1 mm(3) were obtained. Single crystal X-ray Diffraction analysis was done to determine the structure and the crystal belongs to triclinic system, P-1 space group with cell dimensions a=7.2929(3) Å, b=10.5454(4) Å, c=14.2837(6) Å, α=102.0350(10)°, β=99.1580(10)°, γ=102.9170(10)°. Hydrogen bonding stabilises the two dimensional polymeric crystal structure. Fourier Transform Infrared spectroscopic method was utilised for the analysis of various functional groups present in the complex. Elemental analysis confirmed the stoichiometry of the complex. Thermal properties of the crystal were studied by TGA/DTA. The material melts at 368°C. The optical transparency of the crystal was studied using UV-Visible absorption spectra. The optical band gap is found to be 3.35 eV.
authors.affiliation: Department of Physics, M.G. College, Thiruvananthapuram 695004, India.
authors.forename: Lekshmi P
authors.initials: LP
authors.lastname: Nair
authors.affiliation: Department of Physics, H.H.P.B.N.S.S. College, Thiruvananthapuram 695014, India.
authors.forename: B R
authors.initials: BR
authors.lastname: Bijini
authors.affiliation: Department of Physics, H.H.P.B.N.S.S. College, Thiruvananthapuram 695014, India.
authors.forename: S
authors.initials: S
authors.lastname: Prasanna
authors.affiliation: STIC, Cochin University of Science & Technology, Kochi 682022, India.
authors.forename: S M
authors.initials: SM
authors.lastname: Eapen
authors.affiliation: Department of Physics, M.G. College, Thiruvananthapuram 695004, India.
authors.forename: C M K
authors.initials: CM
authors.lastname: Nair
authors.affiliation: Department of Physics, All Saints' College, Thiruvananthapuram 695037, India.
authors.forename: M
authors.initials: M
authors.lastname: Deepa
authors.affiliation: Department of Physics, M.G. College, Thiruvananthapuram 695004, India; Heera College of Engineering & Technology, Thiruvananthapuram 695568, India. Electronic address: mgkrb1956@yahoo.co.in.
authors.forename: K
authors.initials: K
authors.lastname: RajendraBabu
mesh_terms: D000327:Adsorption; D001464:Barium / Q000737:chemistry*; D002625:Chemistry, Organic / Q000379:methods*; D003460:Crystallization; D018360:Crystallography, X-Ray; D004058:Diffusion; D004581:Electronics; D005740:Gases; D005782:Gels; D006358:Hot Temperature; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008298:Maleates / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D005740:Gases; D005782:Gels; D008298:Maleates; D011108:Polymers; D001464:Barium
keywords: Barium maleate; Gel method; Metal organic frame work; Neutral gel