Chapter 4 - Jacobs University

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<strong>Chapter</strong> 9 Unpublished Results Table 9.3: Crystal data and structure refinement for Na 23 [{Y (B-a - SbW 9 O 33 )} 3 (CH 3 COO) 3 (WO 4 )]·51H 2 O (16a) Empirical formula C 6 H 111 Na 23 O 178 Sb 3 W 28 Y 3 fw 9340.50 Crystal system Orthorhombic Space group (No.) Pnma (62) a(Å) 26.11(3) b(Å) 32.049(14) c(Å) 18.408(11) Vol (Å 3 ) 15406(20) Z 4 Temp (K) 173(2) Wavelength (Å) 0.71073 d calcd (Mg/m3) 4.027 abs coeff (mm -1 ) 22.645 R [I > 2α(I)] 0.0762 R w (all data) b 0.2360 177
<strong>Chapter</strong> 9 Unpublished Results 9.2.2.2 Results and discussion The polyanion [{Y(B-a -SbW 9 O 33 )} 3 (CH 3 COO) 3 (WO 4 )] 23- (16) (Figure 9.29) is composed of three units of [a-SbW 9 O 33 ] 9- , three Y 3+ ions and one tetrahedral tungsten. Each unit of [a- SbW 9 O 33 ] 9- is connected through yttrium ion. The compound 16a has C 3v symmetry. The compound 16a was fully characterized in the solid state by single-crystal XRD, TGA-DSC, and IR as well as in solution by 1 H, 13 C and 89 Y NMR . Each yttrium is bound to two [a-SbW 9 O 33 ] 9- via Y-O(W) bonds involving a oxygen of each unit of [a-SbW 9 O 33 ] 9- . The inner coordination sphere of each yttrium center is completed by a acetate ligand, a water molecule (Y-OH 2 = 2.319(6) and 2.329(4) Å; Y-O(W) = 2.296(23), 2.332(26), 2.371(23) and 2.357(23) Å) and a tetrahedral atom which may be tungsten (Y-O(W) = 2.299(3) and 2.244(4) Å) but in that case the site is not fully occupied. The identity of this atom is not clear from the X-ray results. The structural geometry of the yttrium resembles distorted pentagonal bipyramidal; one of the axial oxygens of an acetate is split into two planes (Figure 9.29). The charge of the compound is balanced by sodium. Furthermore, for calculation of available crystal water, we performed TGA measurements on 16 (Figure 9.28) from room temperature to 900 °C which is fully consistent with the formula of 16 provided above. 178
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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 1 Introduction 1.5.3 Medici
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Chapter 1 Introduction (17) Evans,
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Chapter 1 Introduction (48) Mizuno,
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Chapter 1 Introduction (84) Isabell
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Chapter 2 were block-diagonal least
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Chapter 2 Experimental 2.2.3 Synthe
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Chapter 2 Experimental 2.2.7 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 Fi
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Chapter 3 The Wheel-Shaped Cu 20 Cu
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Chapter 3 The Wheel-Shaped Cu 20 20
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Chapter 4 16-Iron Metal Center Nano
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Chapter 5 Organoruthenium POM On th
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Chapter 5 Organoruthenium POM (11)
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Chapter 7 Pt-containing Polyoxometa
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Chapter 9 Unpublished Results Table
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Chapter 9 Unpublished Results 9.3.7
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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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