Publication Date:
2016-01-30
Description:
The reaction of methylammonium halides and cobalt halides yielded the organic-inorganic hybrid compounds of general formula (CH 3 NH 3 ) 2 Co X 4 . By varying the different halides, we were able to synthesize the whole row from Cl to I as well as some mixed halides compounds and to determinate the crystal structures. (CH 3 NH 3 ) 2 Co X 4 (X = Cl, Br, Cl 0.5 Br 0.5 , Br 0.5 I 0.5 ) crystallize isotypic to (CH 3 NH 3 ) 2 HgCl 4 in space group P 2 1 / c with Z = 4 [ X = Cl: a = 7.6483(9), b = 12.6885(18), c = 10.8752(12) Å, β = 96.639(9)°; X = Cl 0.5 Br 0.5 : a = 7.8271(9), b = 12.9543(9), c = 11.1007(11) Å, β = 96.320(8)°; X = Br: a = 7.9782(2), b = 13.1673(2), c = 11.2602(2) Å, β = 96.3260(10)° and X = Br 0.5 I 0.5 : a = 8.2435(12), b = 13.645(2), c = 11.5856(18) Å, β = 95.54(2)°]. The mixed halides show a statistic distribution in both cases. In (CH 3 NH 3 ) 2 CoCl 2 I 2 an ordered variant is realized representing a new structure type [ C 2/ m , Z = 4, a = 18.808(4), b = 7.3604(7), c = 10.4109(17) Å, β = 120.364(13)°]. (CH 3 NH 3 ) 2 CoI 4 crystallizes again isotypic to the respective mercury compound [(CH 3 NH 3 ) 2 HgCl 4 ] [ Pbca , Z = 8, a = 10.9265(5), b = 12.1552(5), c = 20.9588(9) Å]. All structures are build up by inorganic tetrahedral [Co X 4 ] 2– anions and organic (CH 3 NH 4 ) + cations. Additionally the Raman spectra as well as the optical reflectance spectra are discussed.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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