Ultra-high Seebeck coefficient of a thermal sensor through entropic optimisation of ligand length of Fe(ii) spin-crossover (SCO) materials.

In this work, we present a spin-crossover (SCO) complex molecular formulation [Fe(L )](BF) in an electrochemical single couple solution. A Seebeck voltage arises when an electrochemical single couple solution is subjected to a temperature difference, resulting in a single couple reaction at either terminal of the electrochemical cell. The ultrahigh Seebeck coefficients were obtained due to a number of molecular optimisation strategies.

Optimised thermally driven molecular stability of an SCO metal complex for TEC Seebeck generation enhancement.

The thermoelectricity effect allows the generation of electrical potential in an electrolyte upon application of a thermal gradient. In the previous work, the spin crossover effect in metal complexes was shown to be beneficial for generating a high Seebeck coefficient due to the high entropy associated with the conformational change accompanying the spin state change. In this study, we examine the diamagnetic stability of a spin crossover material through optimisation of the ligand chain length.

Mechanism of Action of the Novel Nickel(II) Complex in Simultaneous Reactivation of the Apoptotic Signaling Networks Against Human Colon Cancer Cells.

The aim of this study was to evaluate the cytotoxic potential of a novel nickel(II) complex (NTC) against WiDr and HT-29 human colon cancer cells by determining the IC50 using the standard MTT assay. The NTC displayed a strong suppressive effect on colon cancer cells with an IC50 value of 6.07 ± 0.

Photophysical and electrochemical studies of multinuclear complexes of iron(II) with acetate and extended conjugated N-donor ligands.

A dimeric iron(II) complex, trans-[Fe2(CH3COO)4(L1)2] (1), and a trinuclear iron(II) complex, [Fe3(CH3COO)4(H2O)4(L2)] (2), were studied as potential dye-sensitised solar cell materials. The structures of both complexes were deduced by a combination of instrumental analyses and molecular modelling. Variable-temperature magnetic susceptibility data suggested that 1 was made up of 56.

4,4',6,6'-Tetra-tert-butyl-2,2'-[butane-1,4-diylbis(nitrilo-methanylyl-idene)]diphenol.

The title compound, C(34)H(52)N(2)O(2), is centrosymmetric, the mid-point of the central C-C bond being located on an inversion centre. Intra-molecular O-H⋯N and weak C-H⋯O hydrogen bonds are observed, but no significant inter-molecular inter-actions occur in the crystal structure.

Bis(4-hy-droxy-benzoato-κO,O')bis-(pyridine-κN)copper(II).

In the title compound, [Cu(C(7)H(5)O(3))(2)(C(5)H(5)N)(2)], the Cu atom is located on an inversion center and is coordinated by the N atoms of the two pyridine ligands, trans to each other, and to the carboxyl-ate O atoms of two bidentate 4-hy-droxy-benzoate ligands [Cu-O = 1.9706 (10) and 2.5204 (11) Å].

Bis(μ-hexa-deca-noato-κO:O)bis-[(2,2'-bipyridine-κN,N')(hexa-deca-noato-κO)copper(II)] methanol disolvate.

The asymmetric unit of the title compound, [Cu(2)(C(16)H(31)O(2))(4)(C(10)H(8)N(2))(2)]·2CH(3)OH, contains one half-mol-ecule of the metal complex solvated by a methanol mol-ecule. In the complex, two of the metal atoms are doubly bridged by two monodentate bridging hexa-deca-noate ligands around a center of inversion. The square-pyramidal geometry around each Cu(II) ion is completed by a terminal hexa-deca-noate O atom and two N atoms from a 2,2'-bipyridine ligand.

Diaqua-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κN,N,N,N)copper(II) didodeca-noate dihydrate.

The title compound, [Cu(C(10)H(24)N(4))(H(2)O)(2)][CH(3)(CH(2))(10)CO(2)](2)·2H(2)O, consists of one cationic copper(II) complex, two dodeca-noate anions and two water solvent mol-ecules. The Cu(II) atom is located on an inversion center and is chelated by the four aza N atoms of the neutral 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and by two water mol-ecules in axial positions, giving an octa-hedral coordination geometry, distorted as a consequence of the Jahn-Teller effect. The uncoordinated water mol-ecules link the complex cations and the dodeca-noate counter-ions through O-H⋯O hydrogen bonding, forming a layer structure parallel to (001).

Aqua-(2,2'-bipyridine-κN,N')bis-(4-iodo-benzoato-κO)copper(II).

The Cu(II) atom in the title compound, [Cu(C(7)H(4)IO(2))(2)(C(10)H(8)N(2))(H(2)O)], is N,N'-chelated by a 2,2'-bipyridine ligand and is coordinated by two monodentate carboxyl-ate ions and a water mol-ecule in a distorted square-pyramidal geometry. The apical site is occupied by one of the carboxyl-ate O atoms. The water mol-ecule forms intra-molecular hydrogen bonds to the uncoordinated carboxyl O atoms.

Aqua-(2,2'-bipyridine-κN,N')(3,5-dinitro-benzoato-κO)copper(II) tetra-hydro-furan monosolvate.

The title complex, [Cu(C(7)H(3)N(2)O(6))(2)(C(10)H(8)N(2))(H(2)O)]·C(4)H(8)O, features a penta-coordinate Cu(II) atom bound by two monodentate carboxyl-ate ligands, a bidentate 2,2'-bipyridine mol-ecule [dihedral angle between pyridine rings = 5.0 (2)°] and a water mol-ecule. The resulting N(2)O(3) donor set defines a distorted square-pyramidal geometry with the coordinated water mol-ecule in the apical position.

Diaqua-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κN,N,N,N)copper(II) bis-(4-methyl-benzoate) monohydrate.

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)](C(8)H(7)O(2))(2)·H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type of tetra-gonally distorted octa-hedral geometry. The cations, anions and lattice water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds to form a layer structure parallel to (001).

Diaqua-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κN,N,N,N)copper(II) bis-(2,3,4,5,6-penta-fluoro-benzoate) dihydrate.

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)](C(6)F(5)CO(2))(2)·2H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type tetra-gonally distorted octa-hedral geometry. The Cu(II) atom lies on a center of inversion. The cations, anions and uncoordinated water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, forming a layer structure parallel to (001).

Diaqua-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κN,N,N,N)copper(II) dideca-noate dihydrate.

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)][CH(3)(CH(2))(8)CO(2)](2)·2H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type tetra-gonally distorted octa-hedral geometry. The Cu(II) atom lies on a center of inversion. The cations, anions and uncoordinated water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, forming a layer structure parallel to (001).

Diaqua-(1,4,8,11-tetra-aza-cyclo-tetra-decane-κN,N,N,N)copper(II) dihepta-noate dihydrate.

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)][CH(3)(CH(2))(5)CO(2)](2)·2H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a tetra-gonally Jahn-Teller-distorted octa-hedral geometry. The Cu(II) atom lies on a center of inversion. The cations, anions and uncoordinated water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, forming a layer structure parallel to (100).

{6,6'-Dibromo-4,4'-dichloro-2,2'-[o-phenyl-enebis(nitrilo-methyl-idyne)]diphenolato}nickel(II).

In the title complex, [Ni(C(20)H(10)Br(2)Cl(2)N(2)O(2))], the Ni(II) ion is coordinated by two phen-oxy O atoms and two imino N atoms of the tetradentate ligand, forming a slightly distorted square-planar environment. The mol-ecule is essentially planar, with an r.m.

Tetra-kis(μ(2)-2,2-dimethyl-propanoato-κO,O')bis-[(pyridine-κN)copper(II)]: a monoclinic polymorph.

The structure of the dinuclear title complex, [Cu(2)(C(5)H(9)O(2))(4)(C(5)H(5)N)(2)], represents a monoclinic polymorph of the previously reported triclinic form [Blewett et al. (2006 ▶). Acta Cryst.

2,2'-[Nonane-1,9-diylbis(nitrilo-methyl-idyne)]diphenol.

In the title Schiff base compound, C(23)H(30)N(2)O(2), the complete mol-ecule is generated by crystallographic twofold symmetry, with one C atom lying on the rotation axis. The nonane chain adopts a linear conformation and the hydr-oxy group forms an intra-molecular O-H⋯N hydrogen bond to the imine group.