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The influence of the cations on the condensation of the anions in the salts (A´)Zn(II) Br 4  and (A) 2 Zn(II)Br 4  is studied by  81 Br NQR and X-ray crystal structure analysis. (A´)Zn(II)Br 4  (A´ = [H 3 N(CH 2 ) 3 NH 3 ] 2+ ) (1) shows a phase transition at 474 K. The phase II of (1) crystallizes with isolated [ZnBr 4 ] 2-  tetrahedra: monoclinic P2 1  /n, Z = 4, a = 1108.4 (5), b = 1096.8 (2), c = 1118.5 (6) pm, and β= 117.07(4)° at 296 K. A quartet was observed in the  81 Br NQR spectrum of phase II: 61.634,58062, 56.675, and 53.673 MHz (77K); 59.193, 57.448, 56.015, and 52.515 MHz (301 K).(A) 2  ZnBr 4  (A = [n-H 3 C(CH 2 ) 2 NH 3  ] +  (2) and [n-H 3 C(CH 2 ) 3 NH 3  ] +  (3)) also show structures with isolated [ZnBr 4 ] 2-  tetrahedra. The compound (2) crystallizes with P2 1 /c, Z = 4, a = 771.8(3), b = 1061.9(4), c = 2054.2 (7) pm, and β = 106.75(1)° at 291 K. The compound (3) crystallizes with P2 1 /c, Z = 4, a = 768.9(4), b = 2229.6(10), c = 1071.6(5) pm, and β = 91.70(3)° at 295 K.  81 Br NQR and DSC measurements on [H 3 N(CH 2 ) 4  NH 3 ]ZnBr 4  (4), and [n-H 3  C(CH 2 ) 4 NH 3 ] 2 ZnBr 4  (5) were also performed. The compound (4) shows several phase transitions at 349 K and higher temperatures, and a quartet in the  81 r NQR spectrum could be observed between 77 and 330 K: 65.992,65.544, 59.900, and 50.162 MHz (77 K); 63.787, 62.963, 59.928, and 50.364 MHz (320 K). The compound  (5)  shows also a phase transition at 244 K, and a quartet of  81 Br lines could be observed in the NQR spectrum between 77 and 244 K: 61.279, 58.933, 57.869, and 56.485 MHz (77 K); 59.712, 56.936, 57.409, and 54.793 MHz (240 K). The various influences of the cations, such as size and hydrogen bonds on the condensation of [MX 4 ] 2- (M = Zn, Cd; X = C1, Br) are discussed.

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Isolated versus Condensed Anion Structure III: The Influence of the Cations 1,3-propanediammonium, 1,4-butanediammonium, /n-propylammonium, /n-butylammonium and /n-pentylammonium on Structures and Phase Transitions of ZnBr 4  2-  Salts. A 81  Br NQR and X-ray Structure Analysis