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preface to fifteenth edition

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SPECTROSCOPY 7.119<br />

TABLE 7.72<br />

Silicon-29 Chemical Shifts (Continued)<br />

Structure , ppm Structure , ppm<br />

Hydrides<br />

H 3 Si9<br />

39 <strong>to</strong> 60<br />

9H 2 Si9<br />

5 <strong>to</strong>37<br />

HSi<br />

2 <strong>to</strong>39<br />

Silicates<br />

Orthosilicate anions<br />

69 <strong>to</strong> 72<br />

Silicon in end position<br />

77 <strong>to</strong> 81<br />

Silicon in middle<br />

85 <strong>to</strong> 89<br />

Branching silicons<br />

93 <strong>to</strong> 97<br />

Cross-linked silicons<br />

107 <strong>to</strong> 120<br />

Methyl siloxanes<br />

(CH 3 ) 2 Si9O9 (end position) 6–8<br />

O9<br />

(CH 3<br />

) 2<br />

Si (middle) 18 <strong>to</strong> 23<br />

O9<br />

O9<br />

CH 3<br />

Si(H) (middle) 35 <strong>to</strong> 36<br />

O9<br />

O9<br />

CH 3<br />

Si9O9 (branching) 65 <strong>to</strong> 66<br />

O9<br />

O9<br />

9O9Si9O9 (cross-linked) 105 <strong>to</strong> 110<br />

O9<br />

Polysilanes<br />

F 3 Si9SiF 3<br />

74<br />

Cl 3 Si9SiCl 3<br />

8<br />

(CH 3 O) 3 Si9Si(OCH 3 ) 3<br />

53<br />

(CH 3 ) 3 Si9Si(CH 3 ) 3<br />

20<br />

(CH 3 ) 2 Si[Si(CH 3 ) 3 ] 2<br />

48<br />

HSi[Si(CH 3 ) 3 ] 3<br />

117<br />

Si[Si(CH 3 ) 3 ] 4<br />

135<br />

TABLE 7.73 Phosphorus-31 Chemical Shifts<br />

Values given in ppm on the scale, relative <strong>to</strong> 85% H 3 PO 4 .<br />

Structure<br />

Identical a<strong>to</strong>ms<br />

attached directly<br />

<strong>to</strong> phosphorus<br />

Non-identically substituted phosphorus<br />

R CH 3 R C 2 H 5 R C 6 H 5<br />

P 4 461<br />

PR 3 62 20 6<br />

PHR 2 99 56 41<br />

PH 2 R 164 128 122<br />

PH 3 241<br />

PF 3<br />

97<br />

PRF 2 168 207<br />

PCl 3<br />

220<br />

PRCl 2 192 196 162<br />

PR 2 Cl 94 119 81<br />

PBr 3<br />

227<br />

PRBr 2 184 194 152<br />

PR 2 Br 91 116 71<br />

PI 3<br />

178<br />

P(CN) 3 136<br />

P(SiR 3 ) 3 251<br />

P(OR) 3 141 139 127<br />

P(OR) 2 Cl 169 165 157<br />

P(OR)Cl 2 114 177 173<br />

P(SR) 3 125 115 132<br />

P(SR) 2 Cl 188 186 183<br />

P(SR)Cl 2 206 211 204<br />

P(SR) 2 Br<br />

184

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