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- W292087478 abstract "The crystal structure of the compound Eu(DBM)/sub 2/NO/sub 3/(TPPO)/sub 2/ has been determined (DAR UMB-K instrument, MO K..cap alpha.., spherical sample, heavy-atom method, least-square method in the anisotropic approximation on the basis of 2090 reflections to R = 0.106). The crystals are monoclinic: a = 28.029(4), b = 20.698(3), c = 12.964(3) A, ..gamma.. = 127.87(1)/sup 0/, d/sup (mea)/ = 1.37, d/sup (cal)/ = 1.36 g/cm/sup 3/, ..mu..(Mo K..cap alpha..) = 11.6 cm/sup -1/, Z = 4, space group B2/b. In the isolated molecular complex Eu(DMB)/sub 2/NO/sub 2/(TPPO)/sub 2/ the europium atom is located on a twofold rotational symmetry axis. The coordination polyhedron of Eu is a distorted dodecahedron. The lengths of the Eu-O(DBM), Eu-O(TPPO), and Eu-O(NO/sub 3/) bonds are equal to 2.247(9)-2.335(2), 2.312(5), and 2.549(3) A, respectively. The Eu-NO/sub 3/ chelate ring is planar. The coordination of the phosphorus atom is tetrahedral. The Eu(DMB) fragment of the complex has a slight fold along the O(1)...O(2) line (the angle equals 6.9/sup 0/). The packing of the molecules in a crystal is governed only by van der Waals interactions. It has been postulated that in adducts of europium with neutral ligands the splitting of the Stark components of Eu(III) decreases withmore » decreasing values of the width of the coordination layer ..delta..R.« less" @default.
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- W292087478 date "1986-06-01" @default.
- W292087478 modified "2023-09-27" @default.
- W292087478 title "Crystal and molecular structure of bis(1,3-diphenyl-1,3-propanedionato)bis(triphenylphosphine oxide)nitratoeuropium(III)" @default.
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