located 0.963 A from Pd.2. Crystals were grown from hexane solutions (-40 °C) and mounted in thin-walled glass capillaries under nitrogen. Unit cell parameters were obtained by carefully centering 25 reflections having 29 values between 24 and 28°. Examination of the diffraction symmetry and the systematic Registry No. 1, 111025-75-3; 2, 111025-74-2; [Pd(CO)Cl]", 28551-87-3; Pd, 7440-05-3. Supplementary Material Available: Tables of thermal parameters for 1 and 2 (2 pages); tables of structure factors for 1 and 2 (13 pages).Ordering information is given on any current masthead page.(14) P is used in the calculation of ( 7) to downweight intense reflections in the least-square refinement. The function minimized was > (| '0| -|F |)2, where w = 4(|F0|)2/[E(lf0|)2]2, where [ (| )2]2 = [S\C + R2B) + (7,(|/70|)2)2]/¿.2, where S2 is the scan rate squared, C is the total background count, R2 is the ratio of scan time to background count squared, and L? is the Lorentz-polarization factor. (15) See paragraph at end of paper regrading supplementary material.

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245ChemInform Abstract The title complex (I) (space group C2/c, Z=4) is obtained by reaction of Eu(NO3)3(DMSO)4 with a DMF solution of p-tert.-butylcalix(4)arene (yield given in g). Its X-ray structure analysis confirms that the calixarene ligands adopt a distorted "cone" conformation in which a DMF molecule is included but in such a manner that there is clearly no coordinate interaction with Eu(III). The same type of inclusion is found in the DMSO title adduct of p-tert.-butylcalix(4)arene (P4/n, Z=2).