Thermal and infrared studies of calcium malate crystals grown in diffusion limited medium

Abstract

Single crystals of the title compound Ca (C 4 H 5 O 5 ) 2 .10H 2 O are grown in silica gel using controlled chemical reaction method. Multifaceted single crystals of size up to 8x4x2 mm 3 are obtained . Powder X-Ray Diffraction (XRD) pattern of the grown crystal and the Fourier Transform Infra-Red (FTIR) spectrum in the range 400-4000 cm -1 are recorded. The vibrational bands corresponding to different functional groups are assigned. Thermal decomposition stages observed in the Thermo-gravimetric (TG) and Differential Thermal Analysis (DTA) studies are discussed. A six-stage thermal decomposition scheme is proposed for the compound.

Low molecular weight organic acid salts, markers of old fungi activity in wall paintings

“…The fact that the infrared spectra and XRD patterns obtained do not coincide exactly with the reference data available in the literature [17][18][19] or with the LMWOA salts sintered by us (Fig. 7), may be explained by the extreme complexity of the layers found in the paintings: mixed LMWOA salts showing different degrees of hydration and which are also present in various proportions.…”

“…In this case, two different crystalline LMWOA salts are determined, confirming the presence of more than one LMWOA salts in the brown spots. One of them could be identified as calcium malate dihydrate (JPDF file 00-030-1575) 17 . The second compound could not be related to any of the patterns found either in the literature or among those sintered by us.…”

Vibrational, optical and microhardness studies of trimethoprim DL ‐malate

“…Generally anions were introduced in molecular salt compositions to provide alignment of the molecules [4]. Growth and characterisations of calcium malate and strontium malate have also been reported earlier [5][6]. Present study reports the synthesis and characterisation of the drug molecule trimethoprim [5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diamine] with racemic malic acid (2-hydroxy-1,4-butanedioic acid) as the anionic building block.…”

Spectral, mechanical, thermal, optical and solid state parameters, of metal-organic bis(hydrogenmaleate)-CO(II) tetrahydrate crystal

“…Recently, several researchers have shown keen interest in the growth and characterization of metal coordinated dicarboxylates. In literature, there are many research papers reporting the growth, properties and structural studies of various dicarboxylates such as oxalates, malonates, maleates and so on [1,4,5,[9][10][11][12][13]. Inorganic maleate salts of various metals like copper, nickel, sodium, zinc, iron, cobalt etc., have been reported [4,[14][15].…”