β–α Photoisomerization of cobaloxime complexes in the solid state. I. Different reaction rates in polymorphic crystals

Content Provider	Semantic Scholar
Author	Uchida, Akira Danno, M. Sasada, Yoshio Ohashi, Yuji
Copyright Year	1987
Abstract	Two crystalline forms of (/3-cyanoethyl)bis (dimethylglyoximato) (3-methylpyridine) cobalt(I I I) (dimethylglyoximato =2,3-butanedione dioximato), C 17H25Co N604, [Co(C3H4N)(C4H7N202)2(C6H7N)], were obtained from methanol solutions. Form I: Mr = 436.36, monoclinic, P2Ja, a=23.742 (5), b= 9.496(2), c= 8.819 (1) ~, /3=94.59(2) °, V= 1981.9 (6)/~k3, Z = 4, Dx = 1.463 g cm-3,)t (Mo Ka) = 0.71069A, /z=8.42 cm i, F(000)=912, T=298 K, R=0.057 for 3955 observed reflections; form II: monoclinic, P21/a, a = 21.425 (4), b =9.290 (1), c = 11.517 (2) A, /3 =117.58 (2) °, V=2031.6(7)A3, Z= 4, Dx=l.427gcm -3, A (MoKa)=0.71069~, /~= 8.22 cm -~, F(000) -- 912, T = 298 K, R = 0.048 for 4198 observed reflections. The rate of/3-a isomerization for form II was much greater than that for form I. The structure analysis has shown that the conformations of the /3-cyanoethyl groups in forms I and II are almost the same and that there is greater room around the cyanoethyl group in form II than in form I.
Starting Page	528
Ending Page	532
Page Count	5
File Format	PDF HTM / HTML
DOI	10.1107/S0108768187097374
Alternate Webpage(s)	http://journals.iucr.org/b/issues/1987/06/00/a26692/a26692.pdf
Alternate Webpage(s)	https://doi.org/10.1107/S0108768187097374
Volume Number	43
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article