Inorganic Chemistry Cheat Sheet

The core ideas of Inorganic Chemistry distilled into a single, scannable reference — perfect for review or quick lookup.

PiqCue — piqcue.com/inorganic-chemistry/cheatsheet

Quick Reference

Coordination Chemistry

The study of coordination compounds formed when a central metal atom or ion bonds with surrounding molecules or ions called ligands through coordinate covalent bonds. The coordination number and geometry of these complexes determine their chemical and physical properties.

Crystal Field Theory

A model that explains the electronic structure of transition metal complexes by treating the ligands as point charges that create an electrostatic field, causing d-orbital energy splitting. The pattern of splitting depends on the geometry of the complex.

Ligand Field Theory

An extension of crystal field theory that incorporates molecular orbital theory to more accurately describe bonding in coordination complexes, accounting for both ionic and covalent interactions between the metal center and its ligands.

VSEPR Theory

Valence Shell Electron Pair Repulsion theory predicts the three-dimensional shapes of molecules by assuming that electron pairs around a central atom arrange themselves to minimize mutual repulsion, determining molecular geometry.

Acid-Base Chemistry (Lewis Definition)

In the Lewis framework, an acid is an electron-pair acceptor and a base is an electron-pair donor. This definition is broader than the Bronsted-Lowry model and is essential in inorganic chemistry for understanding coordination and organometallic reactions.

Oxidation States

The hypothetical charge an atom would have if all bonds were completely ionic. Oxidation states are used to track electron transfer in redox reactions and are particularly important for transition metals, which can adopt multiple oxidation states.

Organometallic Chemistry

The study of compounds containing at least one bond between a carbon atom and a metal atom. Organometallic compounds are critical intermediates in catalysis and serve as reagents in organic synthesis.

Solid-State Chemistry

The study of the synthesis, structure, and properties of solid materials, including crystalline solids, amorphous materials, and nanomaterials. It focuses on how atomic arrangements determine bulk physical properties such as conductivity and magnetism.

Bioinorganic Chemistry

The field at the intersection of biology and inorganic chemistry that investigates the role of metal ions and inorganic compounds in biological systems, including metalloenzymes, metal ion transport, and medicinal inorganic chemistry.

Spectrochemical Series

An empirically derived ordering of ligands by their ability to cause d-orbital splitting in transition metal complexes, ranging from weak-field ligands (small splitting) to strong-field ligands (large splitting).

Key Terms at a Glance

Bioinorganic Chemistry:The study of the role of metals and inorganic compounds in biological systems, including metalloenzymes and metal-based drugs.

Chelating Ligand:A ligand that binds to a single metal center through two or more donor atoms, forming a ring structure and creating a more stable complex.

Coordination Number:The number of ligand donor atoms directly bonded to the central metal atom or ion in a coordination complex.

Crystal Field Splitting:The separation of d-orbital energy levels caused by the electrostatic interaction between the metal ion and surrounding ligands. The magnitude of the splitting is denoted $\Delta$.

Crystal Field Theory:A model explaining the electronic structure of transition metal complexes by treating ligands as point charges that create an electrostatic field around the metal.

d-Block Elements:The transition metals occupying groups 3-12 of the periodic table, characterized by partially filled d-orbitals.

EDTA:Ethylenediaminetetraacetic acid, a hexadentate chelating ligand widely used in analytical chemistry, water treatment, and medicine.

Electron Configuration:The distribution of electrons among the available orbitals of an atom or ion, determining its chemical properties and bonding behavior.

f-Block Elements:The lanthanides and actinides, which have partially filled f-orbitals. They are placed separately at the bottom of the periodic table.

Geometric Isomerism:A form of stereoisomerism in which the same atoms are bonded in the same order but differ in their spatial arrangement (cis vs. trans).

Hard-Soft Acid-Base Theory:Pearson's classification where hard acids (small, high charge) prefer hard bases, and soft acids (large, polarizable) prefer soft bases.

Heme:An iron-porphyrin complex found in hemoglobin, myoglobin, and cytochromes, essential for oxygen transport and electron transfer.

Ionization Energy:The energy required to remove an electron from a gaseous atom or ion, influencing oxidation state accessibility and chemical reactivity.

Jahn-Teller Effect:A distortion of molecular geometry that removes orbital degeneracy in non-linear complexes, lowering overall energy.

Lewis Acid:An electron-pair acceptor. In inorganic chemistry, metal cations commonly act as Lewis acids by accepting electron pairs from ligands.

Get study tips in your inbox

We'll send you evidence-based study strategies and new cheat sheets as they're published.

We'll notify you about updates. No spam, unsubscribe anytime.