hetarenes, 670 hetaryl groups, 671 hetarynes, 671 heteroalkenes, 671 heteroarenes, 671 heteroaryl groups, 671 heteroarynes, 672 heterobimetallic complex, 672 heterochain polymer, 672 heteroconjugation, 673 heterocumulenes, 673 heterocyclic compounds, 673 heterocyclyl groups, 673 heterodetic cyclic peptide, 674 heterodisperse, 674 heteroexcimer, 674 heterogeneous diffusion rate constant in electrochemistry , 674 heterogeneous nucleation, 674 heteroleptic, 675 heterolysis (heterolytic), 675 heterolytic bond-dissociation energy, 675 heterolytic dissociative adsorption, 675 heteropolysaccharide (heteroglycan), 676 heterotactic polymer, 676 heterotactic triads in polymers , 676 heterotopic, 676 heterotrophic (organisms), 676 hexagonal graphite, 677 hexahedro – in inorganic nomenclature , 677 hexaprismo – in inorganic nomenclature , 677 high resolution energy loss spectroscopy (HRELS), 677 high-pressure graphitization, 677 high-pressure mercury lamp (arc), 678 higher-order transition, 678 highly oriented pyrolytic graphite, 678