Any combination of a cation associated with molecules or anions containing unshared pairs of electrons. The interaction can range from purely electrostatic to that approaching covalent character.

With respect to a complex we further define:

The term "complex" was found in the following pages:

Instrument database: Agilent Technologies Inc. - 710 Series ICP-OES instruments
Arsenic-Containing Phosphatidylcholines Discovered in Herring Caviar | EVISA's News
All about Molecular Spectroscopy - Resources related to Molecular Spectroscopy | EVISA's News
Reducing mercury pollution entering lakes quickly lowers how much harmful mercury is found in fish | EVISA's News
Journals database: Progress in Lipid Research
Company database: Pfeiffer Vacuum GmbH
Instrument database: Applied Biosystems - 4800 MALDI TOF/TOF™ Analyzer
PLSG Invests $100,000 in Applied Isotope Technologies, Inc., for Development of New Technologies for Environmental and Biological Analyses | EVISA's News
Instrument database: Agilent Technologies Inc. - 6530B Q-TOF LC/MS
Instrument database: Applied Biosystems - 4700 Proteomics Discovery System
Company database: Delta
Fast speciation analysis of inorganic arsenic by using frontal chromatography for separation | EVISA's News
Link database: Geochemical Modeling - Chemical Speciation
Instrument database: Thermo Scientific - TSQ Quantum Access
Journals database: Journal of Cellular Biochemistry
Instrument database: Shimadzu Europe - AA-6300
Link database: EPA-EAD: Method 1636: Hexavalent Chromium by Ion Chromatography
Researchers Reveal Selenium's Metabolism In Life-Giving Amino Acids | EVISA's News
Instrument database: Agilent Technologies Inc. - CE/MS System
Instrument database: Agilent Technologies Inc. - 6550A iFunnel Q-TOF LC/MS