TY - DATA T1 - Attempted Syntheses of Lanthanide(III) Complexes of the Anisole- and Anilinosquarate Ligands PY - 2003/12/15 AU - Patrice M. T. Piggot AU - Lincoln A. Hall AU - Andrew J. P. White AU - David J. Williams UR - https://acs.figshare.com/articles/dataset/Attempted_Syntheses_of_Lanthanide_III_Complexes_of_the_Anisole_and_Anilinosquarate_Ligands/3356617 DO - 10.1021/ic034922p.s002 L4 - https://ndownloader.figshare.com/files/5195926 KW - cationic polymer chains KW - OC KW - Gd KW - squarate ligands KW - bond KW - aqua ligands KW - square antiprismatic coordination geometry KW - Eu KW - square antiprismatic geometry KW - anilinosquarate KW - H 2 O KW - CH KW - squarate ligand exhibits KW - monocapped square antiprismatic geometry KW - C 4 O 4 KW - La KW - Ln KW - Tb KW - lanthanum atom KW - complex KW - NHC N2 - The polymeric lanthanide complexes {Ln(μ-CH3OC6H5C4O3)(CH3OC6H5C4O3)2 (H2O)4·xH2O}n [Ln = La (1), Eu (2), Gd (3)], formed from the reaction of aqueous solutions of anisolesquarate and Ln(NO3)3·xH2O, are all structurally similar with only subtle differences between the lanthanum complex and the isomorphous pair of europium and gadolinium analogues. The lanthanum atom in 1 has a square antiprismatic coordination geometry comprising two pendant and two μ-1,3-bridging anisolesquarate groups and four aqua ligands. Complexes 2 and 3 have two independent metal atoms in their asymmetric units compared to one for the lanthanum complex. However, the gross structures of 1−3 are essentially the same. The asymmetric unit of the terbium complex {(CH3OC6H5C4O3)3Tb(H2O)4(μ-CH3OC6H5C4O3)(CH3OC6H5C4O3)2Tb(H2O)5}·H2O (4) contains two independent binuclear units which hydrogen bond to form an extended structure very similar to those of 1−3. The ionic polymers {[Ln(μ2-C4O4)(H2O)6][C6H5NHC4O3]·4H2O}n [Ln = Eu (5), Gd (6), Tb (7)] result from the incomplete hydrolysis of the anilinosquarate ion during the attempted synthesis of Eu(III), Gd(III), and Tb(III) anilinosquarate complexes. However, complete hydrolysis of the substituent is accomplished by La(III) ions, and the neutral polymer {La2(μ2-C4O4)2(μ3-C4O4)(H2O)11·2H2O}n (8) is formed. In complexes 5−7, the central lanthanide atom has a square antiprismatic geometry, being bonded to two μ-1,2-bridging squarate and six aqua ligands. Two anilinosquarate counteranions participate in second-sphere coordination via direct hydrogen bonding to aqua ligands on each metal center. These counteranions, and the included waters of crystallization, serve to link neighboring cationic polymer chains via an extensive array of O−H···O hydrogen bonds to form a 3-dimensional network. The polymeric lanthanum complex 8 contains two different metal environments, each having distorted monocapped square antiprismatic geometry. For one lanthanum atom the coordination polyhedron comprises five aqua and four squarate ligands, while for the other the polyhedron consists of six aqua and three squarate ligands; in each case one of the aqua ligands occupies the capping position. The squarate ligand exhibits two coordination modes in 8 (μ-1,2- and μ-1,3-bridging), and neighboring polymer chains are cross-linked by hydrogen bonds to form a 3-dimensional network. ER -