Crystal Structure of [Bis(L-Alaninato)Diaqua]Nickel(II) Dihydrate

Khatib, Awni; Aqra, Fathi; Deamer, David W.; Oliver, Allen G.

doi:10.1155/2009/168416

Cited by 9 publications

(12 citation statements)

References 19 publications

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“…The DL-alaninato complex crystallizes as pale blue tabletshaped crystals from a water solution. This crystal structure was markedly different from the structures of the D and L alanine complexes [25].…”

Section: Resultscontrasting

confidence: 72%

“…Because bond length is proportional to bond strength, it should also be possible to calculate free energy of a reaction simply by comparing changes in bond length between reactants and products. The free energy of the reaction between nickel and alanine, calculated from bond length changes determined by X-ray crystallography [23][24][25], also predicted the measured heat of reaction within experimental error. Correlation of free energy change to spectral shift would seem to imply that exited states were the same in reactants and products.…”

Section: Resultsmentioning

confidence: 66%

“…The complexes of nickel with D, L, and DL-alanine exhibited slight differences in bond lengths [23][24][25], particularly the Ni-N1 bond, but these were not significant within the standard uncertainty associated with X-ray diffraction analysis. The crystallographic results for the nickel(II) alanine complexes established an average bond length of 208.6 pm for Ni-O when the oxygen is water oxygen.…”

Section: Resultsmentioning

confidence: 82%

“…Energy differences were also calculated using bond energies extrapolated from bond length differences established by X-ray crystallography [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

“…Small, well-formed crystals were chosen by microscopic examination for crystallographic studies. The crystal structures and crystallographic data of the nickel(II) complexes with D, L, and DL-alanine previously reported with CCDC 718340, 718341, 716012, VAGWAB, and BUNVOV01 [20][21][22][23][24][25] have been investigated in order to establish whether possible differences related to chiral influences could be detected.…”

Section: Crystallization Conditions and X-ray Diffractionmentioning

confidence: 99%

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Studies on crystals of d-, l-, and dl-alaninato nickel(II) complexes

Khatib

Aqra

2009

Transition Met Chem

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An attempt to link the heat of reaction obtained from analysis of UV spectra, bond energies deduced from crystallographic data and calorimetric measurements of [bis(D-, L-, and DL-alaninato)diaqua] nickel(II) dihydrate complexes to theoretical values obtained from calculation is described. The heat of reaction, which includes energy of ligand exchange in addition to crystal field stabilization energy of the three complexes, was calculated from changes in spectral shifts, bond lengths, and free energy between nickel(II) ion and the D-, L-, and DL-alanine complexed nickel(II) ion in aqueous solution. These investigations were done by UV-visible spectroscopy, X-ray crystallography, and isothermal calorimetry. The results reveal that the experimental heat of reaction based on the three mentioned parameters is in good agreement with the theoretical value. The results are found to be of considerable interest in its linking of spectrochemical quantities with thermodynamic functions.

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Section: Resultscontrasting

confidence: 72%

Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 82%

“…Energy differences were also calculated using bond energies extrapolated from bond length differences established by X-ray crystallography [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Section: Crystallization Conditions and X-ray Diffractionmentioning

confidence: 99%

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Studies on crystals of d-, l-, and dl-alaninato nickel(II) complexes

Khatib

Aqra

2009

Transition Met Chem

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Compounds of Amino Acids as Anions

Fleck

Petrosyan

2014

Salts of Amino Acids

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This chapter deals with salts formed from metal cations and amino acid anions. All amino acids can act as monovalent anion; the acidic members glutamic acid and aspartic acid as well as cysteine and tyrosine can form both monovalent and divalent anions. Due to the large number of available cations, a multitude of combinations is possible and in fact found (for the standard twenty amino acids, over 150 crystal structures are published, and many more species have been characterized by other methods). Different hydration states (as reported for the pristine amino acid crystals) occur as well, and the existence of polymorphs is also documented for some cases. The formation of metal-amino acid complexes has been studied in several works (both for a given amino acid and a given cation), and the flexibility of amino acid molecules as ligands allows coordination of cations with different chemical properties (such as charge or ionic radius). Several coordination modes are found for amino acids -the molecules can act as monodentate, bidentate, tridentate, and bridging ligands. The connectivity of the coordination polyhedra of the metal cations is considered -isolated units are frequent, but chains and layers occur as well. Moreover, these units can connect via amino acid molecules to form higher-dimensional structures. Hydrogen bonds (also involving water molecules, both in coordination or in the interstices as crystal water) further stabilize the units, forming relatively stable phases. The frequency of salts varies among the different amino acids, and most examples are reported for glycinate salts, whereas crystals of cations and basic and weakly soluble amino acids are difficult to obtain (e.g., arginate and lysinate salts have not been reported in crystalline state). Finally, the aspect of symmetry is considered (the chirality of most amino acids playing a crucial role), and, consequently, the properties of these salts have impact on applications in the fields of physics, biology, and medicine.

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Promoting Ni(II) Catalysis with Plasmonic Antennas

Han

Tana

Xiao

et al. 2019

Chem

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Plasmonic metal NPs such as Au and Ag are proven to channel visible-light photon energy to nearby metal complexes effectively and allow the conventional metal cationic catalysts to work at moderate temperatures under light irradiation. A key finding is that reactant molecules can be significantly concentrated at the active sites simply by light and thus increase the chance of activation. The merging of plasmonic antenna and metal cationic catalysis will be an inspiring strategy for designing efficient photocatalytic systems.

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Crystal Structure of [Bis(L-Alaninato)Diaqua]Nickel(II) Dihydrate

Cited by 9 publications

References 19 publications

Studies on crystals of d-, l-, and dl-alaninato nickel(II) complexes

Studies on crystals of d-, l-, and dl-alaninato nickel(II) complexes

Compounds of Amino Acids as Anions

Promoting Ni(II) Catalysis with Plasmonic Antennas

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