A new compound（ClO4）2（H2O）0.5（azpy）was synthesized.Its structure was determined by single X-ray diffraction.The crystal belongs to triclinic system,space group P1.The crystallographic data:a=11.813（2）,b=12.574（2）,c=14.580（3）*!,a=84.048（6）,β=77.878（15）,γ=67.902（12）°,V=1961.1（7）*!3,Z=2,F（000）=926,Mr=904.57,Dc=1.532Mg/m3,μ=0.542mm-1,R1=0.0770,and wR2=0.1373.In the ctystal Mn（Ⅱ）ion is coordinated with six nitrogen from three phen ligands to form a distorted octahedron geometry.
Organolanthnoid complexes （Ln（OAr）3, Ln=Sm, Er, Yb: （MeCp）3Yb; （MeCp）2YbOR, Sm（SPh）3（HMPA）, （MeCp）2SmSPh） were found to serve as efficient catalysts precursors for the Aldol-Tishchenko reaction of butanal to give 2-ethyl-1,3-hexanediol monobutyrate in good to high yields under mild conditions. The yields are influenced by the structure of organolanthanoid complexes and the reaction conditions. The yield of trimerization of butanal can reach 85.4% under the certain condition.
