Two Novel Flexible Multidentate Ligands for Crystal Engineering: Syntheses, Structures, and Properties of Cu^II, Mn^II Complexes with N‐[(3‐Carboxyphenyl)sulfonyl]glycine and N,N′‐(1,3‐Phenylenedisulfonyl)bis(glycine)

Abstract

One novel N‐[(3‐carboxyphenyl)sulfonyl]glycine (H3L1) ligand (1) was prepared in high yield, and its structure was determined by single‐crystal X‐ray diffraction. Reaction of H3L1 with Mn(ClO4)2·6H2O at different pH values gave two new dinuclear complexes: [Mn2(HL1)2(phen)4]·16H2O (2) and [Mn2L1(phen)4(H2O)]ClO4·3H2O (3) (phen = 1,10‐phenanthroline). Additionally, two copper(II) complexes, [K2Cu(L2)2(H2O)2]n (4) and [CuL2(H2O)]2·2H2O (5), involving another novel ligand, N,N′‐(1,3‐phenylenedisulfonyl)bis(glycine) (H2L2), were prepared by a one‐pot reaction of 1,3‐phenylenebis(sulfonyl chloride), glycine, and KOH or triethylamine in the presence of CuII ions. A self‐assembled (H2O)30 cluster containing a puckered (H2O)12 ring core was found in 2, which presents a new mode of association of water molecules not predicted theoretically or previously observed experimentally. Furthermore, 2 forms a 2‐D supramolecular structure through hydrogen bonding and unique π–π stacking interactions. In 3, there also exist discrete trimeric water clusters. The identity of the base determines the specific structural characteristics of 4 and 5. When potassium hydroxide was used for the synthesis of 4, it led to a 3‐D copper(II)–potassium(I) coordination polymer; when triethylamine was used, paddle‐wheel dinuclear units of copper(II) carboxylate were produced. Magnetic measurements show that there are weak antiferromagnetic interactions in 2–4. In 5 the χMT vs. T curve shows a minimum at 110 K and a climb from 110 K to 5 K, then a long‐range antiferromagnetic ordering occurs, as revealed by a decrease in χMT with T. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Trinuclear and mononuclear nickel(II) complexes incorporating tridentate 2-[(pyridine-2-ylimine)methyl]phenol ligand: Syntheses, crystal structures and magnetic properties

“…Interest in rational design and synthesis of polynuclear coordination compounds with predictable functionalities, such as bioactivity [1][2][3][4][5], catalytic ability [6][7][8] and magnetic interactions [9][10][11][12][13][14] has increased tremendously in the recent years. Particularly, the design of bridging ligands that display several different coordination modes has been the focus for a great deal of researches, since the discovery that certain paramagnetic polynuclear metal complexes exhibit single-molecular-magnetic properties [15][16][17][18][19][20][21].…”

Crystal structures, bioactivities and fluorescent properties of four diverse complexes with a new symmetric benzimidazolic ligand

“…A closer view of the (H 2 O) 12 cluster illustrates that each water monomer, except for O8, acts as both a hydrogen-bonding donor and accep-tor. In the supramolecular (H 2 O) 12 morphology, the OÁ Á ÁO distances range from 2.592 to 3.079 Å, resulting in an average OÁ Á ÁO distance of 2.800 Å, which is very close to those observed in liquid water (2.80 Å) [18] and comparable to the corresponding value in the ice phase (2.77-2.84 Å) [19]. However, the OÁ Á ÁOÁ Á ÁO angles vary widely (ca.…”

Syntheses, Structures, and Thermal Properties of Two New Mn(II) and Ni(II) Complexes of 3-Nitrobenzenesulfonyl- Glycine Acid and 4-Chlorobenzenesulfonyl-Glycine Acid Ligands

“…[1][2][3][4][5][6] It has been found that Nsulfonyl-amino acids can reproduce the coordination behavior of peptide and their selectivity towards metal ions. [7][8][9][10] The substitution of an Ar-SO − 2 group on amine nitrogen of amino acids such as glycine and L-glutamic increases the coordination donors to three types of O, N donors from carboxyl, sulfoxyl, and amine, respectively, which is able to result in different coordination modes.…”