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<正> Ln(o-ClC6H4CO2)3 (H2O) (Ln = Tb,Nb) ,Mr = 643. 62[628. 89]**, monoclinic,space group P21/n,a=12. 360(2)[12. 373(5)],b=6. 908(0)[7. 021(2)], c = 25. 936(6) [26. 086(9)] A ,β= 101. 30(2) [101. 71 (3)]°,Z= 4,V = 2171. 5(6) [2219(1)] A3,Dc=1. 9