The compounds AuMnPnn (A = Ca, Sr, Ba; Pn = As, Sb), have been synthesized by reacting the elements in stoichiometric amounts in welded Nb tubes sealed in quartz ampules at high temperature (1250 °C). Single-crystal X-ray data (130 K, tetragonal, Iijacd (142), Z = 8) were

New rare-earth transition-metal compounds Eu 14 MnPn 11 and Eu 14 InPn 11 (Pn ) Sb, Bi) have been prepared in quantitative yield from heating stoichiometric amounts of the elements, which are sealed in a welded tantalum tube that is enclosed in a fused silica ampule, at 950-1200 °C. These compounds are isostructural with the Zintl compound Ca 14 -AlSb 11 and crystallize in the tetragonal space group I4 1 /acd (Z ) 8). Single-crystal X-ray data (143 K) were refined for Eu 14 InSb 11 (a ) 17.280 (5) Å, c ) 23.129 (8) Å, R 1 ) 4.04%, wR2 ) 8.65%) and Eu 14 MnBi 11 (a ) 17.632 (4) Å, c ) 23.047(6) Å, R 1 ) 4.53%, wR2 ) 7.83%). The structures of these compounds are compared with Eu 14 MnSb 11 and other compounds of this structure type. Magnetization measurements show that Eu 14 MnSb 11 and Eu 14 MnBi 11 order at approximately 100 and 35 K, respectively. The effective moment in the paramagnetic state for Eu 14 MnSb 11 is µ eff ) 27.0(1) µ B and for Eu 14 MnBi 11 is µ eff ) 27.1(1) µ B . Eu 14 MnSb 11 saturates with µ sat ) 102 µ B at 5 K whereas Eu 14 MnBi 11 does not saturate at 5 K with fields up to 5 T. Eu 14 InSb 11 and Eu 14 InBi 11 are both paramagnetic at high temperatures with µ eff) 30(1) µ B and 30.1(1) µ B , respectively, and have transitions around 10 K to glassy and antiferromagnetic states, respectively.

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Single crystals of chlorine dioxide were grown in situ on a four-circle diffractometer, and the crystal structures were solved at five different temperatures (-75, -90, -110, -130, and -150 °C). At -150 °C, the crystal system, space group, unit cell parameters, and R factor are as follows: orthorhombic, Pbca, a -10.767 (12) k,b = 6.654 (3) Á, c = 5.518 (1) Á, V = 395.29 (48) Á3, Z = 8, R = 0.024. In the solid state, the C102 molecules associate to form weakly bonded dimers which are "head to tail" with respect to one Cl-O bond. The intermolecular interaction was confirmed by magnetic measurements, which show a steep decrease to negative values below -93 °C, and by IR spectroscopy.

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