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A qualitative and quantitative morphological study on the α and β phases of ammonium pentaborate tetrahydrate has been carried out. Crystals of the two phases were obtained by slow evaporation from aqueous solutions. Usually the α phase was obtained with {101}; {01}; {011} and {110} as crystal forms, a high percentage of the crystals (99%) were twins, with a twofold axis parallel to c as the twin law. When MgCl2.6H2O was added to the solution, the β phase was obtained as prismatic crystals elongated along [10] with {111}, {11 } and {001} as crystal forms. Generally, these crystals were also twins, with a twofold axis parallel to [110] as twin law. A qualitative and quantitative morphological study showed the α‐phase crystals to have the theoretical growth forms, while the crystal forms of the β phase were explained by the presence in the solution of (H2O)6Mg2+ and Cl− ions.

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Abstract. fac-Tricarbonyl{[Mn(CO)3(dppe)(C=CPh)].CuCl}, where the carboncarbon triple bond of the phenylethynyl moiety acts as a r/2-acetylene ligand coordinated to the Cu ~ atom, which is thereby in a formally two-coordinated complex. The Mn ion displays a distorted octahedral coordination with the two P atoms of the dppe ligand and the two carbonyl groups in the equatorial plane. The steric hindrance produces an enlargement of the equatorial P--Mn--C angles and a reduction of the apical P--Mn-C angles.

Polymeric Thiolate Complexes of Group 12 tMetals. Crystal and Molecular Structures of catena-[ p-(3-Di methylammonio-I -propanethiolate)] -dichlorocadmium (11) and B is[ 3-(d i met hylammonio) propyl] Disulphide Tetrabromocadmate(ii) 4 lsidre Casals,