The structure of monoclinic cadmium oxydiacetate trihydrate

Abstract

The structure of monoclinic CdO(CHzCOO)2.3H20 has been determined and refined to R = 0-069. The crystals are monoclinic, space group P2Jc, with a 6.3848(7)~b-~ 10.2093(9),c 14.0470(16) A, fl --101.753 (10) °. Z = 4. The crystal structure consists of discrete units of composition 2CdO(CH2COO)2.6H20 held together by hydrogen bonds. In each unit, the two Cd atoms are bridged by two O atoms, one from each oxydiacetate ion, the remaining coordination sites about the seven-coordinate Cd atom being occupied by two more O atoms from one of the bridging oxydiacetate ions, giving a tridentate chelate, and by three water O atoms. The coordination polyhedron is a pentagonal bipyramid and within each unit the two bipyramids have one equatorial edge in common. The Cd-O distances range from 2.236 (7) to 2.492 (8) ,~; the Cd-Cd distance in a unit is 3.968 (I) A. The non-hydrogen atoms are coplanar in each oxydiacetate half with an angle of 8 ° between the planes.

Synthesis and Spectroscopic and X-ray Structural Characterization of R2SnIV−Oxydiacetate and −Iminodiacetate Complexes

“…The different natures of the two carboxylate groups are reflected in the variations in their associated geometrical parameters C( n 2)−O( n 1,2) and, more sensitively, in the associated angular parameters which differ appreciably on either side of the ligand, even about the central O(1). This type of coordination mode is not common, and it has been defined only in the cadmium−oda derivative [Cd(oda)(H 2 O) 3 ] 2 . Although quasi-planar (Figure ), the chelate rings of the tridentate are somewhat puckered.…”

Synthesis and Characterization of Some Metal Complexes with New Nitrogen–Oxygen Donor Macrocyclic Ligands – X-ray Crystal Structures of a 26-Membered Reduced Monoprotonated Macrocycle and a 20-Membered Pendant-Arm Schiff-Base Macrocyclic Cadmium(II) Complex

“…The three Cd-ether oxygen bonds appear to be somewhat elongated, although they fall within the range of 2.36-2.84 Å reported for similar bonds in other cadmium(II) complexes. [43][44][45] The distances and angles in the ligand are normal. The folding of the macrocycle to achieve the hepta-coordination results in an almost coplanar arrangement of the two phenyl rings [interplanar angle 19.9(2)°].…”

Two AgI–Carboxylate Polymers Involving Ag–Ag Interactions: Syntheses, Structures and Fluorescent Properties

“…It is absolutely necessary to refer that each oda 2ligand in compound 2 adopts a μ 7 -(η 2 :η 1 )-(η 2 :η 1 )-η 1 -bridging coordination mode to connect seven Ag + ions. This type of coordination mode is quite different from that in the reported complexes derived from H 2 oda, such as tridentate chelate [25][26][27][28][29][30][31][32][33][34], μ 2 [35][36][37][38][39][40][41], and μ 3 bridging modes [35,[42][43][44][45][46][47][48][49], etc. (Figure 4).…”