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( T o p )
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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Neptunocene
Names
IUPAC name
Bis(η 8 IV )
Other names
Neptunium cyclooctatetraenide2
Identifiers
CAS Number
3D model (JSmol )
InChI=1S/2C5H5.Np/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2
Key: FXDJOXAJBKYPFW-UHFFFAOYSA-N
c1=c[cH-]c=c[cH-]c=c1.[Np+4].c1=c[cH-]c=c[cH-]c=c1
Properties
Chemical formula
C 16 H 16 Np
Molar mass
−1
Appearance
dark brown crystals as a solid, yellow in dilute solution
Solubility in water
insoluble, does not react with water
Solubility in chlorocarbons
sparingly soluble (ca. 0.5 g/L)
Hazards
Occupational safety and health
Main hazards
radiation hazard, pyrophoric
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Neptunocene , Np(C 8 H 8 2 neptunium atom sandwiched between two cyclooctatetraenide (COT2- ) rings. As a solid it has a dark brown/red colour but it appears yellow when dissolved in chlorocarbons , in which it is sparingly soluble.[1] [2] [3] [4] [5] air-sensitive .[1] [2] [5]
It was one of the first organoneptunium compounds to be synthesised, and is a member of the actinocene family of actinide -based metallocenes .[2]
Structure [ edit ]
The sandwich structure of neptunocene has been determined by single crystal XRD .[4] 2- rings are found to be planar with 8 equivalent C–C bonds of 1.385 Å length, and sit parallel in an eclipsed conformation. The Np–COT distance (to the ring centroid) is 1.909 Å and the individual Np–C distances are 2.630 Å.[4]
Neptunocene assumes a monoclinic crystal structure (P 2 1 n space group ) which is isomorphous to uranocene and thorocene but not to plutonocene .[4]
Synthesis and properties [ edit ]
Neptunocene was first synthesised in 1970 by reacting neptunium(IV ) chloride (NpCl4 dipotassium cyclooctatetraenide (K 2 C 8 H 8 diethyl ether or THF :[1]
NpCl4 2 C 8 H 8 C 8 H 8 2
The same reaction conditions have been routinely reproduced since then for the synthesis of the compound.[3] [4]
The three actinocenes uranocene , neptunocene, and plutonocene share virtually identical chemistry: they do not react in the presence of water or dilute base, but are very air-sensitive, quickly forming oxides.[1] [2] [3] −3 M concentrations) in aromatic or chlorinated solvents such as benzene , toluene , carbon tetrachloride or chloroform .[1] [2] [4] [5]
References [ edit ]
^ a b c d e Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1278–1280. ISBN 9780750633659
^ a b c Eisenberg, David C.; Streitwieser, Andrew; Kot, Wing K. (1990). "Electron transfer in organouranium and transuranium systems" . Inorganic Chemistry . 29 1 ): 10–14. doi :10.1021/ic00326a004 . ISSN 0020-1669 . Archived from the original on 2024-05-03. Retrieved 2021-03-22 .
^ a b c d e f Ridder, D. J. A. De; Rebizant, J.; Apostolidis, C.; Kanellakopulos, B.; Dornberger, E. (1996). "Bis(cyclooctatetraenyl)neptunium(IV )" . Acta Crystallographica Section C . 52 3 ): 597–600. doi :10.1107/S0108270195013047 . ISSN 1600-5759 . Archived from the original on 2021-06-12. Retrieved 2021-03-22 .
^ a b c Yoshida, Zenko; Johnson, Stephen G.; Kimura, Takaumi; Krsul, John R. (2006). "Neptunium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF) . Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 699–812. doi :10.1007/1-4020-3598-5_6 . Archived from the original (PDF) on 2018-01-17. Retrieved 2016-08-07 .
t
e
Np(III)
Np(IV )
Organoneptunium(IV ) compounds
Np(V )
Np(VI )
Np(VII)
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Neptunocene&oldid=1231621749 " C a t e g o r i e s : ● N e p t u n i u m c o m p o u n d s ● O r g a n o a c t i n i d e c o m p o u n d s ● M e t a l l o c e n e s H i d d e n c a t e g o r i e s : ● C h e m i c a l s w i t h o u t a P u b C h e m C I D ● A r t i c l e s w i t h o u t I n C h I s o u r c e ● C h e m i c a l p a g e s w i t h o u t C h e m S p i d e r I D ● A r t i c l e s w i t h o u t E B I s o u r c e ● A r t i c l e s w i t h o u t K E G G s o u r c e ● A r t i c l e s w i t h o u t U N I I s o u r c e ● A r t i c l e s c o n t a i n i n g u n v e r i f i e d c h e m i c a l i n f o b o x e s ● C h e m b o x i m a g e s i z e s e t ● C h e m i c a l p a g e s c o n t a i n i n g a l o c a l i m a g e ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a
● T h i s p a g e w a s l a s t e d i t e d o n 2 9 J u n e 2 0 2 4 , a t 0 9 : 0 7 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
