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THE MOLECULAR AND CRYSTAL STRUCTURE OF THE COMPLEX OF 1, 8-NAPHTHO-16-CROWN-5 WITH LANTHANUM NITRATE

WAN ZHU-LI~* RAO ZI-HE LIANG DONG-CAI (Institute of Biophysics, Academia Sinica, Beijing) YAO XIN-KAN YAN SHI-PING WANG GENG-LIN (Department of Chemistry, Nankai University, Tianjin)  
The crystal of the complex of 1,8-naphtho-16-crown-5 with La(NO_3)_3 belongs to monoclinic system,space group P2_1/n,with parameters of unit cell α=15.455A,b=11.512A,c=13.825A,β=109.6°and Z=4.The intensity data of observed refleotions were collected on the PW-1100 four-circle diffractometer with CuK_α radiation.Its structure was determined by heavy-atom method and the coordinates and isotropic temperature factors of all atoms were refined by full-matrix least square method.The final R factor is 0.108.The coordination number of the lanthanum ion is eleven.The five ether oxygens are on one side of the La ion with La—O=2.59~2.78A while six oxygens from three bidentate nitrates are on the other side with La—O=2.59~2.63A.
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