SYNTHESIS AND CHARACTERIZATION OF (NH3-(CH2)2-H3)MCl4 (M = Mn and Cu) HYBRID MATERIAL

• Main Author: KERTI DEWI (NIM: 20514001), KHODIJAH
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22826
• Institution: Institut Teknologi Bandung

In general the term of hybrid material is a combined material of inorganic and organic compounds in the molecular scale. In this research hybrid materials are <br /> <br /> solids containing polymeric anionic metal complexes of [MCl4]2-, alternating with the organic cations (R-NH3 <br /> <br /> +) bilayer or (H3 +N-R-NH3+) monolayer. The purpose <br /> <br /> of combine of organic and inorganic materials are to find new phenomenon resulting from the interaction between the two materials, and combine the useful properties of these two components into a single material. Generally hybrid <br /> <br /> materials of Cu(II) and Mn(II) with primary amines have potential applications as magnetic and electronics materials. However, hybrid with ethyl ammonium (EA) is hygroscopic compounds with low stability. To improve the stability of hybrid material, in this study primary amine that has –NH2 groups at both ends known as ion ethylenediamine (EDA) has been explored. EDA which is an liquid organic compound converted into a salt etilenadiamonium dichloride ((EDA)Cl2) with addition of HCl 32% with 46% yield. The products were characterized by XRD, FT-IR, and molar conductivity measurements. (EDA)MCl4 (M = Mn and Cu) hybrid have been synthesized from their chloride salt and (EDA)Cl2 both in aqueous solvent which further characterized by XRD, UV-visible, MSB, DSC, and SEM. The orange crystals (EDA)MnCl4 has been grown by self assembly technique and isolated from its aqueous solution with 36% yield. This materials is relatively stabile on standing for six months. The hybrid is paramagnetic with an effective magnetic moment of 5.9 BM. Absorption spectrum of (EDA)MnCl4 hybrid showed absorption at 1800 cm-1, 2200 cm-1, 2400 cm-1, 2800 cm-1 and 3000 cm-1. These <br /> <br /> absorption spectrum is a typical absorption of Mn(II) which has many low absorbance. Similarly, the brownish yellow crystal (EDA)CuCl4 has been isolated with rather higher yield (67%). The compound is paramagnetic with an effective magnetic moment of 1.8 BM and very stabile in the open air. Absorption spectrum of (EDA)CuCl4 hybrid showed a broad peak at 1600 cm-1. These spectrum is a <br /> <br /> typical spectrum of Cu(II). Based on XRD (X-ray diffraction) data, sharp diffraction patterns obtained with hkl=00l (l = 2n) repetition indicating that the <br /> <br /> hybrid characteristic have been observed. The distance between two adjacent inorganic on the hybrid (EDA)CuCl4 (8.15 Å) is shorter than (EDA)MnCl4 (8.63 Å). This is caused by Cu2+ radii smaller than Mn2+ radii. Moreover, the Jahn Teller effect on Cu2+ making Cu-Cl bond lengths shorter in axial position. Based on the data the Cu2+ ions position in the polymeric structure are arranged exactly straight while Mn2+ ions slightly shifted. The (EDA)MCl4 (M = Mn and Cu) hybrid are more stable than (EA) MCl4 (M = Mn and Cu) and the thermal stability of (EDA)MnCl4 is higher than (EDA)CuCl4. Based on DSC (Differential Scanning <br /> <br /> Calorimetry) data, (EDA)MnCl4 decomposed at 340&#61616;C while (EDA)CuCl4 decomposed at 255oC.