181 1 ' Spartein . 2 THF kristallisieu in der monoklinen Raumgruppe P2,, u = 921.6(10), b =1766.7(10), r =1098(2)pm, fi =107.65(7)", V = 1703(4) A', Z = 2, Q~~~. =1.127 g~m -~ fur M = 577.8, p = 0.498 mm-'. An einem Kristall der GroBe 0.6 x 0.4 x 0.3 mm wurden auf einem EN- RAF-NONIUS-Vierkreisdiffraktometermit Graphit-monochromatisierter Cu,,-Strahlung bei 163 K 4606 Reflexe vermessen, von denen 4279 unabhingig (R,,, = 0.0533) und 3467 beobachtet ( F > 4u(F/) waren. Losung (PATSEE) [9] und Verfeinerung im SHELXTL PLUS (VMS)-Programmsystem [lo], R = 0.0837, wR = 0.0764, Nicht-Wasserstoffatome

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The following nuclear and molecular constants have been obtained from microwave measurements of the pure rotational spectra of C1CN (7=2-3 transition), BrCN (7=3-4), and ICN (7 = 4-5). The moments of inertia from the ground vibrational states are, in g-cm 2 .0T2. The interatomic distances in A for the ground vibrational states are dca-1.630, dew-1.163, for C1CN; dcBr = 1.789, dew = 1.160, for BrCN; and