ISSN:
1573-1111
Schlagwort(e):
Thiourea
;
tetraalkylammonium salt
;
acetate
;
acetate dimer
;
hydrogen bonding
;
inclusion compound
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract New inclusion complexes (C2H5)4N+CH3CO-°*4(NH2)2CS(1), (n-C3H7)4N+[(CH3CO2)2H]-°2(NH2)2CS (2), (n-C4H9)4N+[(CH3CO2)2H]-°2(NH2)2CS (3) and (CH3)4N+CH3CO2-°(NH2)2CS(4) have been prepared and characterized by X-raycrystallography. Crystal data, MoKα radiation: 1, space groupC2/c, a = 28.702(4), b = 8.457(1), c =22.906(7) Å, β = 98.91(1)°, Z = 8, and RF = 0.048for 2587 observed data; 2, space group P2/n, a = 8.536(2), b = 8.613(1), c = 18.360(2) Å, β = 90.66(2)°, Z = 2, and RF = 0.045 for 1637 observed data; 3,space group P¯1, a = 8.771(3), b = 10.720(1), c = 16.742(2) Å, α = 99.08(6), β = 94.07(2), γ = 95.25(2)°, Z = 2, and RF = 0.063 for 2736 observed data; 4, space group P21/n, a = 8.421(3), b = 16.532(6), c = 8.628(3) Å, β = 90.25(3), Z = 4, and RF = 0.050 for 1507observed data. In the crystal structure of 1, the thiourea moleculesand acetate ions constitute two channel systems aligned parallel to the[110] and [¯110] directions, with thetetraethylammonium cations accommodated in a single column withineach channel. In the crystal structure of 2, hydrogen-bondedcentrosymmetric thiourea dimers and acetate dimers are alternatelyarranged to form a zigzag, puckered ribbon running parallel to [10¯¯1], and the stacked columns of cations are sandwichedbetween undulatory wave layers constructed from the parallelarrangement of [((NH2)2CS)2((CH3CO2)2H)-]∞ ribbons. In the crystal structure of 3,zigzag hydrogen-bonded thiourea ribbons are linked by dimeric acetateanions existing in two different conformations to generate puckeredlayers matching the (002) planes, and the (n-C4H9)4N+ cations occupy the intervening space. Incompound 4 the cations are accommodated in ‘pseudo-channels’generated from infinitely extended thiourea-acetate composite ribbons.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1007941215980
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