PREPARATION, SPECTROSCOPIC CHARACTERIZATION OF A NEW Cd(II) COMPLEX CONTAINING TRIDENTATE NNO SCHIFF BASE DERIVED AND X-RAY CRYSTALLOGRAPHIC STRUCTURAL STUDY OF 3,4,5-TRIHYDROXYBENZOIC ACID[1-(PYRIDYL)-ETHYLIDENE]HYDRAZONE

The synthesis and spectroscopic characterization of the glutaric acid-amide derivative, 2,4-Cl2C6H3N(H)C(=O)(CH2)3C(=O)OH (1), are described. The X-ray crystal structure determination of (1) shows the backbone of the molecule to be kinked about the methylene-C–N(amide) bond as seen in the C(p)–N–C(m)–C(m) torsion angle of −157.0(2)°; m = methylene and p = phenyl. An additional twist in the molecule is noted between the amide and phenyl groups as reflected in the C(m)–N–C(p)–C(p) torsion angle of 138.2(2)°. The most prominent feature of the molecular packing is the formation of supramolecular tapes assembled through carboxylic acid-O–H…O(carbonyl) and amide-N–H…O(amide) hydrogen bonding.

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Structural Characterization of Heterodinuclear ZnII-LnIII Complexes (Ln = Pr, Nd) with a Ring-Contracted H2valdien-Derived Schiff Base Ligand

Journal of Chemical Crystallography ◽

10.1007/s10870-021-00891-4 ◽

2021 ◽

Author(s):

Shabana Noor ◽

Richard Goddard ◽

Fehmeeda Khatoon ◽

Sarvendra Kumar ◽

Rüdiger W. Seidel

Keyword(s):

Molecular Structure ◽

Schiff Base ◽

Structural Characterization ◽

Schiff Base Ligand ◽

Crystal And Molecular Structure ◽

X Ray ◽

X Ray Crystallography ◽

Imidazoline Ring

AbstractSynthesis and structural characterization of two heterodinuclear ZnII-LnIII complexes with the formula [ZnLn(HL)(µ-OAc)(NO3)2(H2O)x(MeOH)1-x]NO3 · n H2O · n MeOH [Ln = Pr (1), Nd (2)] and the crystal and molecular structure of [ZnNd(HL)(µ-OAc)(NO3)2(H2O)] [ZnNd(HL)(OAc)(NO3)2(H2O)](NO3)2 · n H2O · n MeOH (3) are reported. The asymmetrical compartmental ligand (E)-2-(1-(2-((2-hydroxy-3-methoxybenzylidene)amino)-ethyl)imidazolidin-2-yl)-6-methoxyphenol (H2L) is formed from N1,N3-bis(3-methoxysalicylidene)diethylenetriamine (H2valdien) through intramolecular aminal formation, resulting in a peripheral imidazoline ring. The structures of 1–3 were revealed by X-ray crystallography. The smaller ZnII ion occupies the inner N2O2 compartment of the ligand, whereas the larger and more oxophilic LnIII ions are found in the outer O2O2’ site. Graphic Abstract Synthesis and structural characterization of two heterodinuclear ZnII-LnIII complexes (Ln = Pr, Nd) bearing an asymmetrical compartmental ligand formed in situ from N1,N3-bis(3-methoxysalicylidene)diethylenetriamine (H2valdien) through intramolecular aminal formation are reported.

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151Eu Mössbauer Spectroscopic Characterization of EuRu4B4 and the New Boride EuRuB4

Zeitschrift für Naturforschung B ◽

10.1515/znb-2010-0116 ◽

2010 ◽

Vol 65 (1) ◽

pp. 90-94 ◽

Cited By ~ 3

Author(s):

Thomas Harmening ◽

Rainer Pöttgen

Keyword(s):

Boron Atom ◽

Mössbauer Spectra ◽

Induction Furnace ◽

Spectroscopic Characterization ◽

Two Dimensional ◽

Temperature Dependent ◽

X Ray ◽

Trivalent Europium ◽

Mossbauer Spectra

Samples of EuRu4B4 and of the new boride EuRuB4 were prepared from europium, RuB, and RuB4 precursor alloys, respectively, in sealed tantalum tubes in an induction furnace. EuRu4B4 crystallizes with the LuRu4B4 structure, a = 748.1(1), c = 1502.3(4) pm. The structure of EuRuB4 was refined on the basis of X-ray diffractometer data: Pbam, a = 599.7(1), b = 1160.7(3), c = 358.06(7) pm, wR2 = 0.0691, 474 F2 values, and 38 variables. The four crystallographically independent boron sites build up layers which consist of almost regular pentagons and heptagons which sandwich the ruthenium and europium atoms, respectively. Within the two-dimensional [B4] networks each boron atom has a slightly distorted trigonal-planar boron coordination with B-B distances in the range 172 - 186 pm. Temperature-dependent 151Eu Mössbauer spectra show stable trivalent europium for EuRu4B4 and EuRuB4

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