HYDROGEN-BONDS IN O-PHENYLENEDIAMMONIUM AND M-PHENYLENEDIAMMONIUM AQUAPENTAFLUORO METALLATES(III) (M(III) = AL, CR, FE)

m- and o-Phenylenediammonium-[MIIIF5(H2O)] compounds of Al, Cr and Fe were synthesized and characterized by X-ray single crystal structure a nalysis. All structures are described in the space group P2(1)2(1)2(1) (Z = 4). m-Ph(NH3)22+ (Ph(NH3)22+ = phenylenediammonium) compounds: A l: a = 6.489(2), b = 7.943(2), c = 18.204(2) angstrom, R/wR = 0.084/0. 050 for 1533 reflections; Cr: a = 6.571(2), b = 8.006(2), c = 18.456(3 ) angstrom, R/wR = 0.050/0.040 for 1571 reflections; Fe: a = 6.608(2), b = 8.052(2), c = 18.424(4) angstrom, R/wR = 0.042/0.034 for 1 947 re flections. o-Ph(NH3)22+ compounds: Al: a = 6.580(2), b = 7.891(2), c = 18.319(5) angstrom, R/wR = 0.050/0.045 for 2 370 reflections; Cr: a = 6.642(2), b = 7.954(2), c = 18.484(4) angstrom, R/wR = 0.065/0.043 fo r 2041 reflections; Fe: a = 6.693(2), b = 7.995(4), c = 18.529(7) angs trom, R/wR = 0.035/0.033 for 2651 reflections. Isolated distorted octa hedral [MIIIF5(H2O)]2- anions are connected by double O-H ... F hydrog en bonds of alternating strength to form chains in the b direction. Th ose chains, packed in a pseudohexagonal way, are further linked by the ammonium functions of the phenylenediammonium cations to a 3D hydroge n bond network.