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In the solid, the BeCl2 molecules polymerise to make long chains. They do this by forming coordinate bonds (dative covalent bonds) between lone pairs on chlorine atoms and adjacent beryllium atoms. The diagram shows a simple dimer - the start of the polymerisation process.

Note: This is exactly the same as the coordinate bonding in aluminium chloride. If you aren't happy about coordinate (dative covalent) bonding, it would pay you to look at this page before you go on.

You can see from the last diagram that the beryllium atoms are still electron deficient. The process continues. The next diagram shows the coordinate bonds in the conventional way using arrows. The arrow goes from the atom which is supplying the pair of electrons to the atom with the empty orbital.

Structure and dynamics of homoleptic beryllocenes: A solid-state 9Be and 13C NMR study,

Stimulated-echo NMR spectroscopy of 9Be and 7li in solids: method and application to ion conductors,

Beryllium-9 NMR study of solid bis(2,4-pentanedionato-O,O')beryllium and theoretical studies of 9Be electric field gradient and chemical shielding tensors. First evidence for anisotropic beryllium shielding,

Alignment echo of spin-3/2 9Be nuclei: detection of ultraslow motion,

Slow atomic motion in Zr-Ti-Cu-Ni-Be metallic glasses studied by NMR,

Correlation between 9Be MAS NMR spectra and the geometry of beryllium containing framework structures,

Line shapes and widths of MAS sidebands for 27Al satellite transitions. Multinuclear MAS NMR of tugtupite Na8Al2Be2Si8O24Cl2,

The incorporation of alkalis in beryl: multi-nuclear MAS NMR and crystal-structure study,

Goodrich's Electro-Optical Systems has had over thirty years of experience in the development and manufacture of beryllium optics and assemblies. As a result we have produced some of the most successful cryogenic all-beryllium telescopes including the Midcourse Airborne Target Signatures (MATS) sensor, the Infrared Astronomical Sensor (IRAS) Optical Subsystem, and the Infrared Telescope Technology Testbed (ITTT) for the Jet Propulsion Laboratory's Space Infrared Telescope Facility (SIRTF).

Some properties of Beryllium optics include:

High thermal conductivity;

Very high specific stiffness;

Opaque material but transparent to x-rays.

DOE-WIDE CENTRAL IRB TO REVIEW BERYLLIUM RESEARCH
The Office of Science (SC), with support from the Office of Environment, Safety and Health (EH),under the authority of 10 CFR 745, Protection of Human Subjects, and DOE P 443.1, Protection of Human Subjects, is announcing the establishment of a Central Beryllium Institutional Review Board (Be IRB). The Be IRB will provide a high-level of expertise and diverse, experienced members to address beryllium-related human subjects protection issues. It will provide DOE, DOE contractors, and any other organization(s) engaged in research on Be exposure, testing, or disease funded by DOE and/or involving the DOE workforce with a thorough and consistent review that is essential to protection of the volunteer subjects in these programs.