3
This work has been digitalized and published in 2013 by Verlag Zeitschrift für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namensnennung 4.0 Lizenz. A New Preparation of S4N4 M. P. Berthet*, H. Vincent, a n d Y . Monteil Laboratoire de Physicochimie Minerale I, associe au C. N. R. S. No. 116, 43 Boulevard du 11 Novembre 1918, F 69622 Villeurbanne Cedex Z. Naturforsch. 35b, 329-331 (1980); received September 17/November 16, 1979 Tetrasulfur Tetranitride Synthesis, Thiazyl Halogenide Decomposition, Metal Reaction, Monothiazyl Chloride Stability, IR Spectra Pure S4N4 is prepared by a new method from reduction of S3N3CI3 by various metals (Hg, Cu, Sn). Realized either in an inert solvent or directly in gaseous phase the reaction is complete. The stability range of NSC1 has been determined by Raman spectrometry. Tetrasulfur tetranitride is a very interesting p r o d u c t b e c a u s e i t i s t h e s t a r t i n g m a t e r i a l f o r many products containing sulfur and nitrogen. In the usual method S4N4 (1) is prepared by bubbling gaseous ammonia through a solution of sulfur di- chloride dissolved i n a n i n e r t solvent: 1 6 N H 3 + 6 S C l s -> S4N4 + 1 2 N H 4 C1 + 2 S Besides S4N4, NH 4 C1 and S , t h e S7NH i m i n e i s also f o r m e d i n s m a l l q u a n t i t y . NH4CI i s e a s i l y eliminated by iced water. The separation of S4N4 from the obtained mixture i s d i f f i c u l t . T h e t h r e e compounds (S4N4, S7NH and S) have similar molecular struc- tures (puckered eight-membered rings), they have similar solubilities in solvents and are difficult to separate from one another. The extraction of S4N4 by dioxane permits t o p a r t l y eliminate sulfur. S4N4 can be purified by chromatography on an alumina column (2), benzene, a good solvent for S4N4, i s u s e d f o r i t s e l u t i o n . By sublimation under vacuum i t i s p o s s i b l e t o e l i m i n a t e s u l f u r f r o m S4N4, but this method i s d a n g e r o u s due t o t h e explosive character of S4N4. The methods of purification are long and not always very efficient. For the first time, we have prepared S4N4 in a h i g h purity grade from S3N3CI3 which can b e e a s i l y obtained ( 3 ) . T h i s n e w method consists in the action of reducing metals such as Hg, Cu or Sn on S3N3CI3 either i n a n i n e r t solvent o r d i r e c t l y i n g a s e o u s phase. T h e i d e n t i f i c a t i o n and the stability of the different gaseous compounds have b e e n s t u d i e d by i n f r a r e d a n d Raman spectro- scopy. * Reprint requests to Dr. M. P. Berthet. 0340-5087/80/0300-0329/$ 01.00/0 A. Action of Metals on S3N3C13 in Solution During the study of the chlorination of S4N4 in CCI4 by Raman spectrometry, we have shown the existence o f t h e t w o f o l l o w i n g e q u i l i b r i a (4): S4N4 + Cl a ^ S4N4CI2 (a) S4N4CI2 + Cl 2 ^ S3N3CI3 + NSC1 (b) S3N3CI3 dissolved i n a n inert solvent is unstable. A f t e r 3 d a y s , a t r o o m temperature t h e s o l u t i o n i s a mixture containing mainly S3N3CI3, but also NSC1, S4N4CI2 and S4N4 easily identified by infrared spectroscopy. The same mixture i s o b t a i n e d in half an h o u r , i f t h e solution of S3N3CI3 is refluxed. S4N4 a p p e a r s i n s o l u t i o n , ( a ) a n d ( b ) e q u i l i b r i a are displaced due to a CI2 elimination which is acceler- ated by refluxing the solution. If we add to it a metal which reduces chlorine, we completely dis- p l a c e t h e e q u i l i b r i a t o t h e formation of S4N4. Several metals have been studied: Hg, Sn, Cu. T h e s e m e t a l s a r e v e r y r e a c t i v e w i t h c h l o r i n e b u t are inert towards S4N4. Mercury, added t o a 2 • 1 0 2 M S4N4 solution in CCI4, i s i m m e d i a t e l y covered with a d e p o s i t m a i n l y c o n s i s t u t e d b y H g 2 C l 2 . T h e solution composition is followed by infrared spectrometry; the mixture is strongly agitated. After 4 h , the spectrum shows only the S4N4 bands. After the s e p a r a t i o n o f H g and H g 2 C l 2 , t h e s o l u t i o n i s evapo- rated under vacuum. S4N4 i s r e c r y s t a l l i z e d in CS2. The y i e l d i s a b o u t 65%. Tin and copper lead to similar results, however, t h e r e a c t i o n t i m e is m u c h l o n g e r . D u r i n g t h e contact with the S3N3CI3 solution, the metals are covered with chloride, which stops the reaction; it is im- portant t o a d d some pure metal. B. Action of Metals on S3N3C13 in Gaseous Phase We have also studied the action of metals on N S C 1 w h i c h h a s t h e s a m e N / S r a t i o t h a n S4N4. This

A New Preparation of S N - zfn.mpdl.mpg.dezfn.mpdl.mpg.de/data/Reihe_B/35/ZNB-1980-35b-0329.pdf · with HNO3, then dried. The upper part is provided with a glove finger filled with

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Page 1: A New Preparation of S N - zfn.mpdl.mpg.dezfn.mpdl.mpg.de/data/Reihe_B/35/ZNB-1980-35b-0329.pdf · with HNO3, then dried. The upper part is provided with a glove finger filled with

This work has been digitalized and published in 2013 by Verlag Zeitschrift für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution4.0 International License.

Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschungin Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung derWissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht:Creative Commons Namensnennung 4.0 Lizenz.

A New Preparation of S4N4

M . P . B e r t h e t * , H . V i n c e n t , a n d Y . M o n t e i l

Laboratoire de Physicochimie Minerale I, associe au C. N. R. S. No. 116, 43 Boulevard du 11 Novembre 1918, F 69622 Villeurbanne Cedex

Z. Naturforsch. 35b, 329-331 (1980); received September 17/November 16, 1979

Tetrasulfur Tetranitride Synthesis, Thiazyl Halogenide Decomposition, Metal Reaction, Monothiazyl Chloride Stability, IR Spectra

Pure S4N4 is prepared by a new method from reduction of S3N3CI3 by various metals (Hg, Cu, Sn). Realized either in an inert solvent or directly in gaseous phase the reaction is complete. The stability range of NSC1 has been determined by Raman spectrometry.

T e t r a s u l f u r t e t r a n i t r i d e i s a v e r y i n t e r e s t i n g

p r o d u c t b e c a u s e i t i s t h e s t a r t i n g m a t e r i a l f o r m a n y

p r o d u c t s c o n t a i n i n g s u l f u r a n d n i t r o g e n . I n t h e

u s u a l m e t h o d S4N4 ( 1 ) i s p r e p a r e d b y b u b b l i n g

g a s e o u s a m m o n i a t h r o u g h a s o l u t i o n o f s u l f u r d i -

c h l o r i d e d i s s o l v e d i n a n i n e r t s o l v e n t :

1 6 N H 3 + 6 S C l s - > S4N4 + 1 2 N H 4 C 1 + 2 S

B e s i d e s S4N4, N H 4 C 1 a n d S , t h e S7NH i m i n e i s a l s o

f o r m e d i n s m a l l q u a n t i t y . N H 4 C I i s e a s i l y e l i m i n a t e d

b y i c e d w a t e r . T h e s e p a r a t i o n o f S4N4 f r o m t h e

o b t a i n e d m i x t u r e i s d i f f i c u l t . T h e t h r e e c o m p o u n d s

(S4N4, S7NH a n d S ) h a v e s i m i l a r m o l e c u l a r s t r u c -

t u r e s ( p u c k e r e d e i g h t - m e m b e r e d r i n g s ) , t h e y h a v e

s i m i l a r s o l u b i l i t i e s i n s o l v e n t s a n d a r e d i f f i c u l t t o

s e p a r a t e f r o m o n e a n o t h e r . T h e e x t r a c t i o n o f S4N4 b y d i o x a n e p e r m i t s t o p a r t l y e l i m i n a t e s u l f u r .

S4N4 c a n b e p u r i f i e d b y c h r o m a t o g r a p h y o n a n

a l u m i n a c o l u m n ( 2 ) , b e n z e n e , a g o o d s o l v e n t f o r

S4N4, i s u s e d f o r i t s e l u t i o n . B y s u b l i m a t i o n u n d e r

v a c u u m i t i s p o s s i b l e t o e l i m i n a t e s u l f u r f r o m S 4 N 4 ,

b u t t h i s m e t h o d i s d a n g e r o u s d u e t o t h e e x p l o s i v e

character of S4N4.

T h e m e t h o d s o f p u r i f i c a t i o n a r e l o n g a n d n o t

a l w a y s v e r y e f f i c i e n t . F o r t h e first t i m e , w e h a v e

p r e p a r e d S4N4 i n a h i g h p u r i t y g r a d e f r o m S3N3CI3 w h i c h c a n b e e a s i l y o b t a i n e d ( 3 ) . T h i s n e w m e t h o d

c o n s i s t s i n t h e a c t i o n o f r e d u c i n g m e t a l s s u c h a s

H g , C u o r S n o n S3N3CI3 e i t h e r i n a n i n e r t s o l v e n t

o r d i r e c t l y i n g a s e o u s p h a s e . T h e i d e n t i f i c a t i o n a n d

t h e s t a b i l i t y o f t h e d i f f e r e n t g a s e o u s c o m p o u n d s

h a v e b e e n s t u d i e d b y i n f r a r e d a n d R a m a n s p e c t r o -

s c o p y .

* Reprint requests to Dr. M. P. Berthet. 0340-5087/80/0300-0329/$ 01.00/0

A. Action of Metals on S3N3C13 in Solution D u r i n g t h e s t u d y o f t h e c h l o r i n a t i o n o f S4N4 i n

CCI4 b y R a m a n s p e c t r o m e t r y , w e h a v e s h o w n t h e

e x i s t e n c e o f t h e t w o f o l l o w i n g e q u i l i b r i a ( 4 ) :

S4N4 + Cla ^ S4N4CI2 (a)

S4N4CI2 + Cl2 ^ S3N3CI3 + NSC1 (b)

S3N3CI3 d i s s o l v e d i n a n i n e r t s o l v e n t i s u n s t a b l e .

A f t e r 3 d a y s , a t r o o m t e m p e r a t u r e t h e s o l u t i o n i s a

m i x t u r e c o n t a i n i n g m a i n l y S3N3CI3, b u t a l s o N S C 1 ,

S4N4CI2 a n d S4N4 e a s i l y i d e n t i f i e d b y i n f r a r e d

s p e c t r o s c o p y . T h e s a m e m i x t u r e i s o b t a i n e d i n h a l f

a n h o u r , i f t h e s o l u t i o n o f S3N3CI3 i s r e f l u x e d .

S4N4 a p p e a r s i n s o l u t i o n , ( a ) a n d ( b ) e q u i l i b r i a a r e

d i s p l a c e d d u e t o a CI2 e l i m i n a t i o n w h i c h i s a c c e l e r -

a t e d b y r e f l u x i n g t h e s o l u t i o n . I f w e a d d t o i t a

m e t a l w h i c h r e d u c e s c h l o r i n e , w e c o m p l e t e l y d i s -

p l a c e t h e e q u i l i b r i a t o t h e f o r m a t i o n o f S4N4.

S e v e r a l m e t a l s h a v e b e e n s t u d i e d : H g , S n , C u .

T h e s e m e t a l s a r e v e r y r e a c t i v e w i t h c h l o r i n e b u t a r e

i n e r t t o w a r d s S4N4. M e r c u r y , a d d e d t o a 2 • 1 0 2 M

S4N4 s o l u t i o n i n CCI4, i s i m m e d i a t e l y c o v e r e d w i t h

a d e p o s i t m a i n l y c o n s i s t u t e d b y H g 2 C l 2 . T h e s o l u t i o n

c o m p o s i t i o n i s f o l l o w e d b y i n f r a r e d s p e c t r o m e t r y ;

t h e m i x t u r e i s s t r o n g l y a g i t a t e d . A f t e r 4 h , t h e

s p e c t r u m s h o w s o n l y t h e S4N4 b a n d s . A f t e r t h e

s e p a r a t i o n o f H g a n d H g 2 C l 2 , t h e s o l u t i o n i s e v a p o -

r a t e d u n d e r v a c u u m . S4N4 i s r e c r y s t a l l i z e d i n CS2. T h e y i e l d i s a b o u t 6 5 % .

T i n a n d c o p p e r l e a d t o s i m i l a r r e s u l t s , h o w e v e r ,

t h e r e a c t i o n t i m e i s m u c h l o n g e r . D u r i n g t h e c o n t a c t

w i t h t h e S3N3CI3 s o l u t i o n , t h e m e t a l s a r e c o v e r e d

w i t h c h l o r i d e , w h i c h s t o p s t h e r e a c t i o n ; i t i s i m -

p o r t a n t t o a d d s o m e p u r e m e t a l .

B. Action of Metals on S3N3C13 in Gaseous Phase W e h a v e a l s o s t u d i e d t h e a c t i o n o f m e t a l s o n

N S C 1 w h i c h h a s t h e s a m e N / S r a t i o t h a n S4N4. T h i s

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330 M. P. Berthet et al. • A New Preparation of S4N4

g a s e o u s c o m p o u n d i s o b t a i n e d f r o m S3N3CI3 o r

S4N3CI ( 5 ) . O n h e a t i n g , t h e s e t h i a z y l c h l o r i d e s

d e c o m p o s e a c c o r d i n g t o :

S3N3CI3 -> 3 NSC1 2 S4N3CI - > 2 N S C 1 + S 4 N 4 + 2 S

W e h a v e s t u d i e d t h e first r e a c t i o n w h i c h l e a d s t o

t h e f o r m a t i o n o f N S C 1 a l o n e .

B. 1. Stability range of NSCl

W e c h e c k e d t h e s t a b i l i t y r a n g e o f N S C l i n o r d e r

t o ^ d e t e r m i n e t h e b e s t c o n d i t i o n s o f t h e N S C l

r e a c t i o n o n m e t a l s . T h e S3N3CI3 d e c o m p o s i t i o n w a s

s t u d i e d b y i n f r a r e d a n d R a m a n s p e c t r o m e t r y . T h e

m e t h o d s u s e d a l l o w t o r e c o r d t h e s p e c t r a d i r e c t l y

a t t h e s t u d i e d t e m p e r a t u r e .

B. 1.1. Experimental techniques

R a m a n s p e c t r o m e t r y : t h e a p p a r a t u s i s a C O D E R G

P H O s p e c t r o g r a p h , t h e s c a t t e r e d l i g h t i s f o c u s e d o n

t h e c a t h o d i c t u b e o f a E M 1 9 5 5 p h o t o m u l t i p l i e r t u b e .

T h e l a s e r i s a S p e c t r a P h y s i c s M o d e l 1 6 4 a r g o n i o n

l a s e r o f 1 W , w i t h p h o t o n e n e r g y o f 2 0 , 4 9 0 c m - 1

( w a v e l e n g t h 4 8 8 0 Ä ) . W e u s e d t h e f o l l o w i n g d e v i c e :

t h e r e a c t o r i s a c y l i n d r i c a l p y r e x t u b e o f 5 0 c m 3 ,

e n d e d b y a flat s u r f a c e . T h e t u b e i s p l a c e d i n t h e

a x i s o f a n o v e n c o n s t i t u t e d b y t h r e e h e a t i n g e l e -

m e n t s s e p a r a t e l y r e g u l a t e d , w h i c h a l l o w s t o o v e r -

h e a t l i g h t l y t h e n e a r p a r t o f t h e s p e c t r o g r a p h t o

a v o i d d e p o s i t s o n t h e o p t i c s u r f a c e o f t h e c e l l . T h e

l a s e r b e a m i s p e r p e n d i c u l a r t o t h e a x i s o f t h e t u b e .

T h e s a m p l e ( 5 0 m g ) i s p l a c e d i n t o t h e t u b e s e a l e d

u n d e r v a c u u m . T h e t e m p e r a t u r e s w e r e o b t a i n e d

w i t h a c h r o m e l - a l u m e l t h e r m o c o u p l e .

I n f r a r e d s p e c t r o m e t r y : t h e a p p a r a t u s i s a P e r k i n

E l m e r 4 5 7 s p e c t r o m e t e r . T h e a n a l y s i s c e l l i s c o n s t i -

t u t e d b y a b o d y i n s t a i n l e s s s t e e l o n w h i c h i s w o u n d

a h e a t i n g r e s i s t a n c e . T h e w i n d o w s a r e m a d e o f K B r .

T h e t i g h t n e s s t o g a s i s r e a l i z e d b y t o r i c g a s k e t s i n

v i t o n , w h i c h a l l o w s t o w o r k u n d e r v a c u u m . W e

m e a s u r e t h e t e m p e r a t u r e w i t h a t h e r m o c o u p l e

p l a c e d a l o n g - s i d e t h e t u b e i n t h e o v e n .

B. 1.11. Besults

W e h a v e o b s e r v e d t h e d e c o m p o s i t i o n o f S3N3CI3 f r o m 9 0 ° C w i t h p r o d u c t i o n o f N S C l e a s i l y i d e n t i f i -

a b l e b y i t s t h r e e v i b r a t i o n s a l l v i s i b l e i n R a m a n

( F i g . ) a n d i n f r a r e d s p e c t r o m e t r y :

269

at 90°C 92

456

cm"1

S2Cl2 S2CI2 S2CI2

at 120° C

Figure. Raman spectrum of NSCl.

n = 1 3 2 1 c m - 1 , v2 = 4 1 4 c m - 1 , v 3 = 2 6 9 c m - 1 .

B y s t u d y i n g t h e N S C l d e p o s i t o n C s l w i n d o w a t

1 5 K , P e a k e [ 6 ] h a s o b s e r v e d t h e s e t h r e e v i b r a t i o n s

i n i n f r a r e d s p e c t r o m e t r y .

vi = 1 3 2 7 c m - 1 , V2 = 4 0 3 , 7 5 c m - 1 ,

v 3 = 2 6 7 , 4 c m - 1 .

T h e s l i g h t l y s h i f t e d v a l u e s o f t h e f r e q u e n c i e s c a n b e

e x p l a i n e d b y t h e e x p e r i m e n t a l t e c h n i q u e s u s e d .

T h e r a n g e o f N S C l i s r e l a t i v e l y n a r r o w . B y

i n c r e a s i n g t h e t e m p e r a t u r e t o 1 2 0 ° C , b e s i d e N S C l ,

w e n o t i c e t h e f o r m a t i o n o f S2CI2: 9 2 c m - 1 (p) ,

1 9 7 c m - 1 ( p ) a n d 4 5 6 c m - 1 ( p ) . T h e d i s u l f u r d i -

c h l o r i d e r e s u l t s f r o m t h e d e c o m p o s i t i o n o f N S C l

a c c o r d i n g t o :

2 N S C l - * S2CI2 + N2

A b o v e t h i s t e m p e r a t u r e , o n l y S2CI2 e x i s t s .

W e m u s t p o i n t o u t t h a t o u r i n f r a r e d s p e c t r a a r e

m o r e c o m p l e x t h a n o u r R a m a n o n e s . A s a m a t t e r o f

f a c t , d u r i n g t h e i n f r a r e d s t u d y o f t h e S3N3CI3 d e c o m p o s i t i o n , w e c a n n o t a v o i d t h e c o n d e n s a t i o n

o f s o l i d o n t h e w i n d o w s w h i c h a r e o b v i o u s l y a t a

l o w e r t e m p e r a t u r e t h a n t h e g a s . T h i s d e p o s i t g i v e s

f u r t h e r a b s o r p t i o n b a n d s w h i c h c a n b e a t t r i b u a t e d

t o S3N3CI3, S3N2CI2 a n d S 6 N 4 C 1 2 . T h e f o r m a t i o n o f

t h e s e s o l i d t h i a z y l c h l o r i d e s r e s u l t s f r o m t h e f o l l o w -

i n g r e a c t i o n s :

3 N S C l -> S3N3CI3

2 N S C l - > S 2 C 1 2 + N 2

S2CI2 + 2 N S C l - * S3N2CI2 + SCI2 3 S3N2CI2 - > S 6 N 4 C 1 2 + 2 N S C l + S C 1 2

A s m a l l a m o u n t o f S O 2 w a s a l s o f o u n d i n t h e

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331 M. P. Berthet et al. • A New Preparation of S4N4

o b s e r v e d i n f r a r e d s p e c t r u m p r o b a b l y d u e t o t h e

f o l l o w i n g r e a c t i o n o f N S C 1 w i t h w a t e r v a p o u r :

N S C 1 + 2 H 2 0 - > N H 3 + S 0 2 + H C l

B. 2. NSCl-metal reaction

W e s t u d i e d t h e a c t i o n o f c o p p e r o n N S C 1 .

B. 2.1. Experimental device

A r e a c t i v e t u b e ( 0 = 4 0 m m ) i s p l a c e d o n a

v a c u u m r a c k . I n t h e m e d i u m p a r t o f t h i s t u b e i s a

1 0 c m p l u g o f c o p p e r t u r n i n g s p r e v i o u s l y w a s h e d

w i t h H N O 3 , t h e n d r i e d . T h e u p p e r p a r t i s p r o v i d e d

w i t h a g l o v e finger filled w i t h l i q u i d n i t r o g e n . T h e

l o w e r p a r t c o n t a i n i n g S3N3CI3 i s p u t i n a t h e r m o -

s t a t e d b a t h a t 9 5 ° C . T o a v o i d t h e d e p o s i t o f

S3N3CI3 o n t h e r e a c t o r w a l l s b e f o r e t h e z o n e c o n -

t a i n i n g c o p p e r , i t w a s n e c e s s a r y t o d i p t h e t u b e

d e e p l y i n t h e b a t h .

B. 2.11. Besults

W h e n t h e c o p p e r i s i n c o n t a c t w i t h N S C 1 , i t g e t s

i m m e d i a t e l y d a r k a n d t h e g l o v e finger i s g r a d u a l l y

c o v e r e d w i t h y e l l o w S4N4. A f t e r t h e c o m p l e t e

s u b l i m a t i o n , w e c o l l e c t p u r e S4N4 o n t h e g l o v e

finger; t h e g r e a t e r p a r t o f S4N4 s t a y s o n t h e c o p p e r .

T h e n t h e l a t t e r i s t r e a t e d b y c a r b o n d i s u l f i d e ; S4N4 i s s o l u b l e a n d r e c o v e r e d a f t e r e v a p o r a t i o n o f t h e

s o l u t i o n . T h e i n s o l u b l e r e s i d u e , c h a r a c t e r i z e d b y

X - r a y s i s t h e c u p r o u s c h l o r i d e .

W e h a v e a l s o e x t r a c t e d S 4 N i f r o m t h e d e p o s i t o n

c o p p e r b y s u b l i m a t i o n a t 1 0 0 ° C .

T o c o n c l u d e w e c a n s c h e m a t i z e t h e f o r m a t i o n o f

S4N4 f r o m S3N3CI3 a n d c o p p e r b y t h e f o l l o w i n g

r e a c t i o n s :

S3N3CI3 -> 3 NSC1 (g) N S C 1 + C u C u C l + I / 4 S 4 N 4

W e h a v e t r i e d t o f o l l o w " i n s i t u " t h e m e c h a n i s m

o f t h e S 3 N 3 C I 3 - C U r e a c t i o n b y i n f r a r e d s p e c t r o -

m e t r y b y u s i n g a h e a t e d c e l l : c o p p e r t u r n i n g s d o

n o t i n f l u e n c e t h e r e c o r d i n g o f i n f r a r e d s p e c t r a . T h e

o n l y g a s w h i c h a p p e a r s i s N S C 1 , w e h a v e n o t

o b s e r v e d t h e f o r m a t i o n o f a n a n o t h e r g a s e o u s

s p e c i m e n s u c h a s S N o r S 2 N 2 .

[1] M. Becke-Goehring, Inorg. Synth. 6, 124 (1960). [2] M. Villena-Blanco and W. L. Jolly, J. Chromatogr.

16, 214 (1964). [3] W. L. Jolly and K. D. Maguire, Inorg. Synth. 9,

102 (1967).

[4] H. Vincent and Y. Monteil, Synth. React. Inorg. Met.-Org. Chem. 8 (1), 51 (1978).

[5] L. Patton and W. L. Jolly, Inorg. Chem. 9 (5), 1079 (1970).

[6] St. C. Peake and A. J. Downs, J. Chem. Soc. Dalton Trans. 1974, 859.