Synthesis，Crystal Structure and Infrared Spectrum of Lanthanum Dinuclear Coordination Compound with Alanine：〔La_2（ala）_4（H_2O）_8〕·（ClO_4）_6

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Synthesis,Crystal Structure and Infrared Spectrum of Lanthanum Dinuclear Coordination Compound with Alanine:[La_2(ala)_4(H_2O)_8]·(ClO_4)_6

Lanthanum coordination compound with l-alanineLa_2(ala)_4(H_2O)_8]·(ClO_4)_6(ala=l-alanine) was synthesized by reaction of lanthanum perchlorate with l-alanine in aqueous solution and obtained in the form of single crystals.The X-ray crystal structure has been determined and the IR spectrum has been studied.The title compound Cl_6La_2C_12H_44O_40N_4,M_r=1375.2,crystallizes in the triclinic,space group P1 , with parameters: a= 11.227(3),b=11.445(2),c=11.014(3),α=114.46(2),β=114.51(2),γ=78.62(2)°,V=1171.73,Z=1,Dc=1.95 g/cm￣3,F(000)=680,μ=22.9 cm￣-1(MoKα).The final R=0.050,R_ω=0.051.In the crystal,two lanthanum ions are coordinated by four alanine molecules via four carboxylate bridges to form a dinuclear coordination compound.Four water molecules are coordinated to each lanthanum ion. There is a symmetric centre between the two lanthanum ions.The IR spectrum of the coordination compound and the relationship between the IR spectrum and the structure have been studied.The mechanism of the configuration inversion of alanine has been proposed.