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>Primary to secondary sphere coordination of 18-crown-6 to lanthanide (III) nitrates: Structural analysis of Pr(NO3)3-(18-crown-6) and M(NO3)3(OH2)3·18-crown-6 (M=Y, Eu, Tb−Lu)
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Primary to secondary sphere coordination of 18-crown-6 to lanthanide (III) nitrates: Structural analysis of Pr(NO3)3-(18-crown-6) and M(NO3)3(OH2)3·18-crown-6 (M=Y, Eu, Tb−Lu)
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机译：Primary to secondary sphere coordination of 18-crown-6 to lanthanide (III) nitrates: Structural analysis of Pr(NO3)3-(18-crown-6) and M(NO3)3(OH2)3·18-crown-6 (M=Y, Eu, Tb−Lu)
The direct reaction of hydrated lanthanide nitrate salts with 18-crown-6 in 3∶1 CH3CN∶CH3OH has resulted in the isolation and structural characterization of Pr(NO3)3(18-crown-6) and M(NO3)3(OH2)3·18-crown-6 (M=Y, Eu, Tb−Lu). (The Eu and Yb analogs were confirmed with preliminary cell data only.) Pr(NO3)3(18-crown-6) is 12-coordinate icosahedral and crystallizes in the orthorhombic space group Pbca with (at 20°C)a=12.230(2),b=15.598(4),c=21.777(9)Å andDcalc=1.89 g cm−3forZ=8. The seven isostructural Pr(NO3)3(18-crown-6) complexes all contain 9-coordinate capped square antiprismatic metal centers hydrogen bonded via the bound water molecules to D3d18-crown-6 within the lattice to form hydrogen bonded polymeric chains. Each complex is orthorhombic Pnma with cell parameters as follows: M=Tb (20°C):a=15.242(6),b=14.253(11),c=11.070(6)Å,Dcalc=1.83 g cm−3forZ=4; M=Dy (20°C):a=15.248(3),b=14.239(5),c=11.058(3)Å,Dcalc=1.84 g cm−3forZ=4; M=Y (19°C):a=15.260(2),b=14.238(2),c=11.048(3) Å,Dcalc=1.64 g cm−3for Z=4; M=Ho (20°C):a=15.226(4),b=14.208(15),c=11.028(3)Å,Dcalc=1.86 g cm−3forZ=4; M=Er (20°C):a=15.250(3),b=14.208(7),c=11.028(3)Å,Dcalc=1.87 g cm−3forZ=4; M=Tm (20°C):a=15.246(6),b=14.190(16),c=11.013(6) Å,Dcalc=1.88 g cm−3forZ=4; M=Lu (21°C):a=15.244(9),b=14.158(6),c
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