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ABSTRACT The structure of the title compound [Sm 2 (crot) 6 (H 2 O) 4 ] 2 ·3(H 2 O) (I), (crot= crotonate = butenoate = O 2 CCHCHCH 3 )] consists of two independent, centrosymmetric dimeric units, of similar composition but diverse coordination, viz., one of them doubly bridged (2×[ h2:h1:m2]) and the remaining one quadruply bridged (2×[h1:h1:m2], 2×[h2:h1:m2]). The asymmetric unit is completed by three solvato water molecules, one of them depleted (occupation: 0.735 (14) ). The difference in bridging strengths is readily evidenced in the two quite dissimilar Sm···Sm distances observed: 4.1402 (8)A,(doubly bridged), 3.9439 (8)A (quadruply bridged). SmO 9 polyhedra suyvey similar coordination distances which span the range 2.388 (3)-2.611 (3)A for one of the Sm cations and 2.357 (3)-2.588 (3)A for the other. All water hydrogens are involved in H-bonding, leading to the formation of a strongly linked 2D structure parallel to (010). These planar arrays are in turn transversally linked by one single bridging water molecule. There are in addition C═ C···C═C p interactions providing both to intra as well as intra planar cohesion. The compound is isomorphous to its Gd isologue

journal of the chilean chemical society

CRYSTAL STRUCTURE OF HEMIKIS(TETRAKIS(&amp;#956;2-2-BUTENOATO)-BIS(2-BUTENOATO)-TETRA-AQUA-DI-SAMARIUM) HEMIKIS(BIS(&amp;#956;2-BUTENOATO)-TETRAKIS(2-BUTENOATO) TETRA AQUA-DI-SAMARIUM) TRIHYDRATE