Application of Co-ordination Compounds

Flashcards covering key vocabulary, structural features, bonding parameters, and analytical applications of metal carbonyls, bioinorganic complexes, and chelating agents from the lecture notes.

Mononuclear Carbonyls

Carbonyl complexes containing only one metallic atom per molecule, represented as $M(CO)_y$ (e.g., $Cr(CO)_6$).

Polynuclear Carbonyls

Carbonyl complexes containing two or more metallic atoms per molecule, represented as $M_x(CO)_y$ (e.g., $Fe_3(CO)_{12}$).

Chromium Hexacarbonyl Structure

An octahedral mononuclear complex ($Cr(CO)_6$) with $d^2sp^3$ hybridization, featuring a linear $M-CO$ bond, a $Cr-C$ bond length of $1.92\,\text{\AA}$, and a $C-O$ bond length of $1.16\,\text{\AA}$.

Iron Pentacarbonyl

A mononuclear carbonyl ($Fe(CO)_5$) with trigonal bipyramidal shape and $dsp^3$ hybridization, possessing an apical $Fe-C$ bond length of $1.806\,\text{\AA}$ and an equatorial $Fe-C$ bond length of $1.833\,\text{\AA}$.

Nickel Tetracarbonyl

A mononuclear carbonyl ($Ni(CO)_4$) with tetrahedral shape and $sp^3$ hybridization, having a $Ni-C$ bond length of $1.50\,\text{\AA}$.

Dimanganese Decacarbonyl

A binuclear carbonyl complex ($Mn_2(CO)_{10}$) where each manganese atom undergoes $d^2sp^3$ hybridization and the $Mn-Mn$ bond distance is $2.79\,\text{\AA}$.

Cobalt Octacarbonyl

A binuclear carbonyl complex ($Co_2(CO)_8$) existing in bridged and non-bridged structural forms, where each cobalt atom is $d^2sp^3$ hybridized and the $Co-Co$ bond distance is $2.52\,\text{\AA}$.

Di-iron Ennea Carbonyl

A diamagnetic binuclear carbonyl ($Fe_2(CO)_9$) composed of two face-sharing octahedra, containing $3$ bridging carbonyls, $6$ terminal carbonyls, and an $Fe-Fe$ bond distance of $2.46\,\text{\AA}$.

Heme Group

An iron-porphyrin complex in haemoglobin consisting of a central $Fe(II)$ atom coordinated to four nitrogen atoms of a planar, conjugated porphine ligand.

Haemoglobin Sub-unit

A structural component of haemoglobin consisting of a heme group, a globin protein chain, and a histidine unit.

Phorphine Ligand

A macrocyclic ligand with nitrogen donor centers that combines with $Fe$ to form the structure of the heme group.

Chlorophyll

A magnesium-porphyrin complex acting as a green pigment in plants, where central $Mg$ is bonded to four nitrogen atoms of porphyrin to convert light energy into chemical energy during photosynthesis.

Vitamin B12

A cobalt-containing co-enzyme complex (cyanocobalamin) where $Co(III)$ is octahedrally coordinated at the center of a non-conjugated macrocyclic corrin ring, a sugar-phosphate-base organic unit, and a sixth ligand $x$.

Pernicious Anaemia

A medical condition in humans caused by a deficiency of vitamin $B_{12}$.

EDTA

Ethylene diamine tetra acetic acid, a hexadentate ligand with $2$ nitrogen and $4$ oxygen donor centers used to estimate and remove water hardness by forming complexes with $Ca^{2+}$ and $Mg^{2+}$.

Eriochrome Black T

An indicator used during EDTA titration for water hardness at pH $10$, changing from wine red to blue at the end point.

Dimethyl Glyoxime (DMG)

An organic precipitant used to quantitatively precipitate nickel as a rosy red $Ni(DMG)_2$ complex for gravimetric analysis.

Oxine

An organic reagent ($8\text{-hydroxy quinoline}$) that forms crystalline metal precipitates such as $[Al\text{-oxine}]$ for the gravimetric estimation of aluminium.