Author
Milan Melnik
Other affiliations: York University, Slovak University of Technology in Bratislava, Comenius University in Bratislava ...read more
Bio: Milan Melnik is an academic researcher from University of York. The author has contributed to research in topics: Copper & Crystal structure. The author has an hindex of 26, co-authored 219 publications receiving 2513 citations. Previous affiliations of Milan Melnik include York University & Slovak University of Technology in Bratislava.
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01 Jan 1988
TL;DR: In this paper, the coordination number of a central entity is defined as the number of bonds formed by the central entity and ligand atoms, and the bond lengths between two entities are signed M-L.
Abstract: The search for the factors causing distortions of surroundings of central entities is the subject of interest especially of chemists. It is the region of interatomic vector lengths, which are less than the most probable minimum value a 0′ = 4.25 A, where it is already difficult to suppose a fitting of some known statistical model. The non-rigid properties of central entities in this region, let us call it the coordination sphere of entity Mz+, apparently manifest themselves also in distortions of the geometry of arrangement of monatomic ligand entities. In agreement with the commonly used terms for describing crystal structures of compounds we will call monatomic entities of ligands “ligand atoms” resp. atoms. The number of bonds formed by the central entity is the coordination number. The bond lengths between the central entity and ligand atoms will be signed M-L.
TL;DR: This manuscript summarizes and analyzes X-ray data of monomeric cis-PtP2CCl derivatives, which exist in two isomeric forms, of the distortion isomer type.
Abstract: This manuscript summarizes and analyzes X-ray data of monomeric cis-PtP2CCl derivatives. These complexes crystallize in the following crystal systems: tetragonal, P42/n (3), triclinic, Pī (10), orthorhombic, P212121 (prevails)(16), and monoclinic, P21/c (prevails) (36) examples. There are three sub-groups of the respective complexes: Pt(η1-PL)2(η1-CL)(η1-Cl); Pt(η2-P2L)(η1-CL)(η1-Cl) and Pt(η1-PL)(η2-P,CL)(η1-Cl). The chelating P,P-donor ligands form: four-(POP, PCP), five-(PC2P), six-(PC3P, PCNCP), seven-(PC4P) and even ten-(PCNCNCNCP) membered rings. The chelating P.C-donor ligands create three-(PC), four-(PCC) and five-(PC2C) membered rings. The mean Pt-L bond distance elongates in the sequence: 2.10 A (C, trans to P) < 2.222 A (P, trans to Cl) < 2.312 A (P, trans to C) < 2.360 A (Cl, trans to P). There are examples which exist in two isomeric forms, of the distortion isomer type.
TL;DR: In this article , structural data of over fifty monomeric complexes of Pt(κ3-P1C1P2)X (X = H, OL, NL, CL, Cl, Br or I) were summarized and analyzed, and the effect of both electronic and steric factors influences on the l-Pt-L bite angles.
TL;DR: In this paper, a review of polymeric FeM complexes is presented, where the inner coordination spheres about the Fe(0) atom are tetrahedral or sandwiched (FeC4) or FeC10), Fe(II) atoms are six-coordinated, and Fe(III) are six or even sevencoordinated.
Abstract: This review covers crystallographic and structural data for almost fifty polymeric FeM complexes (M = transition Cu, Ag, Au, Mo, W, Mn, Co, Ni and Pt and lanthanide elements Sm, Er and Yb) where iron is involved in polymeric chains. The complexes are for the most part yellow or black, but there are complexes of brown, orange, red, purple, blue and green colour. The complexes crystallized in the monoclinic (by far prevails), triclinic, tetragonal, orthorhombic, trigonal, hexagonal and rhombohedral crystal classes. The iron atoms are found in oxidation states 0, +2 and +3, of which +3 by far prevails. The inner coordination spheres about the Fe(0) atom are tetrahedral (FeC4) or sandwiched (FeC10), Fe(II) atoms are six-coordinated, and Fe(III) are six or even seven-coordinated. The inner coordination about M atoms range from four- through six- to eight-coordinated. The shortest Fe-Fe, Fe-M (transition) and Fe-M (lanthanide) and M-M separations are: 8.08 A, 3.033 A for Fe-Cu, 3.010 A for Fe-Yb and 2.505 A for Mo-Mo.
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TL;DR: A comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals, including a brief introduction to nucleation and growth within the context of metal Nanocrystal synthesis, followed by a discussion of the possible shapes that aMetal nanocrystal might take under different conditions.
Abstract: Nanocrystals are fundamental to modern science and technology. Mastery over the shape of a nanocrystal enables control of its properties and enhancement of its usefulness for a given application. Our aim is to present a comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals. We begin with a brief introduction to nucleation and growth within the context of metal nanocrystal synthesis, followed by a discussion of the possible shapes that a metal nanocrystal might take under different conditions. We then focus on a variety of experimental parameters that have been explored to manipulate the nucleation and growth of metal nanocrystals in solution-phase syntheses in an effort to generate specific shapes. We then elaborate on these approaches by selecting examples in which there is already reasonable understanding for the observed shape control or at least the protocols have proven to be reproducible and controllable. Finally, we highlight a number of applications that have been enabled and/or enhanced by the shape-controlled synthesis of metal nanocrystals. We conclude this article with personal perspectives on the directions toward which future research in this field might take.
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TL;DR: The state of the art in the field of antimicrobial polymeric systems during the last decade is described in this paper, where a classification of the different materials is carried out dividing basically those synthetic polymers that exhibit antimicrobial activity by themselves; those whose biocidal activity is conferred through their chemical modification; those that incorporate antimicrobial organic compounds with either low or high molecular weight; and those that involve the addition of active inorganic systems.
1,063 citations
TL;DR: In this article, the role of the shape of coordinating ligands and of different metal ions in directing the synthesis totally or preferentially towards mono-, di- or poly-nuclear entities is discussed.
871 citations