Chapter 4 - Jacobs University

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<strong>Chapter</strong> 9 Unpublished Results 9.1.8 Synthesis of K 24 Li 12 [(UO 2 ) 4 (P 8 W 48 O 184 )]·33H 2 O (13a) A sample of K 28 Li 5 [H 7 P 8 W 48 O 184 ]·92H 2 O (0.185 g, 0.0125 mmol) was dissolved in 0.5M LiCH 3 COO buffer solution (20 mL) at pH 4.0 then UO 2 (NO 3 ) 2·7H 2 O (0.043 g, 0.0165 mmol) was added. Then the solution was heated to 80 o C for 1h and filtered hot. The resulting solution was layered with 1 M NH 4 Cl (1 mL). The filtrate was allowed to evaporate in an open beaker at room temperature. After one week a dark yellowish crystalline product started to appear. After that, the evaporation was allowed to continue until the solution level approached the solid product which was then collected by filtration and air dried. Yield: 0.13g (60%). IR : 1140(s), 1093(s), 1026(m), 987(m), 954(sh), 927 (s), 843(s), 770(sh), 747(sh), 688(sh), 573(w), 531(w), 466 (w) cm -1 . 75 70 65 60 55 %Transmittance 50 45 40 35 30 25 20 15 10 1200 1100 1000 900 800 Wavenumbers (cm-1) 700 600 500 Figure 9.20 FT-IR spectrum of 13a. 163
<strong>Chapter</strong> 9 Unpublished Results 9.1.8.1 Results and discussion The polyanion [(UO 2 ) 4 (P 8 W 48 O 184 )] 36- (13) (Figure 9.21) eight uranium atoms which are disordered over eight positions. So, the polyanion 13 contains only four uranium ions in the cavity of [H 7 P 8 W 48 O 184 ] 33- precursor. Figure 9.21 Polyhedral/ball and representation of 13. Color scheme: U, P and WO 6 units are shown by green, blue and red respectively. 164
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Synthesis, Structure and Properties
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"The greatest book of philosophy, w
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system, space group I4/m, unit cell
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Acknowledgements The accomplishment
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teaching, and Professor Maravanji S
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2.1.2 Single crystal X-ray diffract
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5.5 Conclusion…………………
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9.1.6.1 Results and discussion…
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9.3.5 Synthesis of K 12 [Hf 4 (µ 2
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Crespo………………………
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Figure 5.4 ORTEP view of the asymme
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Figure 9.6 31 P NMR of 7a in H 2 O/
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Figure 9.34 TGA spectrum of 17a…
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Figure 9.62 FTIR spectrum of 23a…
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Table 9.6 Crystal data and structur
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Chapter 1 Introduction heteropolyan
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Chapter 1 Introduction 1.3 Structur
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Chapter 1 Introduction C) Keggin a-
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Chapter 1 Introduction shows no suc
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Chapter 1 Introduction α-[P 2 W 18
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Chapter 1 Introduction Figure 1.7 B
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Chapter 1 Introduction [P 2 W 18 O
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Chapter 2 Experimental 2.2.3 Synthe
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Chapter 2 Experimental 2.2.11 Synth
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Chapter 2 Experimental 2.3Reference
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Chapter 3 The Wheel-Shaped Cu 20 in
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Chapter 3 The Wheel-Shaped Cu 20 3.
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Chapter 3 The Wheel-Shaped Cu 20 Cu
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Chapter 9 Unpublished Results Table
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Curriculum Vitae SIB SANKAR MAL Dep
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EDUCATION PhD Jacobs University (20
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POSTER, ORAL PRESENTATION 1. Poster
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6. “Two Iron-Containing Tungstoge
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Appendix
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Appendix
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