Related Experiment Video
Updated: Jun 16, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
Published on: December 29, 2016
Two polymorphs of a lead(II) complex with 8-hydroxy-2-methylquinoline and thiocyanate
Gholamhossein Mohammadnezhad1, Mostafa M Amini, Vratislav Langer
1Department of Chemistry, General Campus, Shahid Beheshti University, Tehran 1983963113, Iran.
Abstract:
Two distinct polymorphs of bis(mu(2)-methylquinolin-8-olato)-kappa(3)N,O:O;kappa(3)O:N,O-bis[(isothiocyanato-kappaN)lead(II)], [Pb(2)(C(10)H(8)NO)(2)(NCS)(2)], (I), forming dinuclear complexes from a methanolic solution containing lead(II) nitrate, 2-methylquinolin-8-ol (M-Hq) and KSCN, crystallized concomitantly as colourless prisms [form (Ia)] and long thin colourless needles [form (Ib)]. In both cases, the complexes lie across a centre of inversion. The polymorphs differ substantially in their conformation and in their interactions, viz. Pb...S and pi-pi for form (Ia) and Pb...S, Pb...pi and C-H...pi for form (Ib).
Related Concept Videos
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Formation of Complex Ions
Valence Bond Theory
Coordination Number and Geometry
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Extraction: Advanced Methods

